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1
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0002979402
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a) K. C. Nicolaou, D. Vourloumis, N. Winssinger, P. S. Baran, Angew. Chem. 2000, 112, 46-126; Angew. Chem. Int. Ed. 2000, 39, 44-122;
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Angew. Chem.
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Nicolaou, K.C.1
Vourloumis, D.2
Winssinger, N.3
Baran, P.S.4
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2
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0037563364
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a) K. C. Nicolaou, D. Vourloumis, N. Winssinger, P. S. Baran, Angew. Chem. 2000, 112, 46-126; Angew. Chem. Int. Ed. 2000, 39, 44-122;
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Angew. Chem. Int. Ed.
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-
-
4
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0001237986
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-
Domino processes, for example, are an elegant way to reach this goal: a) L. F. Tietze, U. Beifuss, Angew. Chem. 1993, 105, 137- 170; Angew. Chem. Int. Ed. Engl. 1993, 32, 131-163; b) L. F. Tietze, Chem. Rev. 1996, 96, 115-136.
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Tietze, L.F.1
Beifuss, U.2
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5
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33750173220
-
-
Domino processes, for example, are an elegant way to reach this goal: a) L. F. Tietze, U. Beifuss, Angew. Chem. 1993, 105, 137- 170; Angew. Chem. Int. Ed. Engl. 1993, 32, 131-163; b) L. F. Tietze, Chem. Rev. 1996, 96, 115-136.
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Angew. Chem. Int. Ed. Engl.
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-
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6
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7044235263
-
-
Domino processes, for example, are an elegant way to reach this goal: a) L. F. Tietze, U. Beifuss, Angew. Chem. 1993, 105, 137- 170; Angew. Chem. Int. Ed. Engl. 1993, 32, 131-163; b) L. F. Tietze, Chem. Rev. 1996, 96, 115-136.
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Tietze, L.F.1
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8
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0001614660
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a) H. Schinz, L. Ruzicka, U. Geyer, V. Prelog, Helv. Chim. Acta 1946, 29, 1524-1528;
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Helv. Chim. Acta
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Schinz, H.1
Ruzicka, L.2
Geyer, U.3
Prelog, V.4
-
11
-
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0001451413
-
-
Syntheses of rac-1: a) K. Biemann, G. Büchi, B. H. Walker, J. Am. Chem. Soc. 1957, 79, 5558-5564; b) K. Tamao, S. Kodama, T. Nakatsuka, Y. Kiso, M. Kumada, J. Am. Chem. Soc. 1975, 97, 4405-4406; c) H. Saimoto, T. Hiyama, H. Nozaki, Tetrahedron Lett. 1980, 21, 3897-3898; d) F. Hadj-Abo, M. Hesse, Helv. Chim. Acta 1992, 75, 1834-1839.
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Biemann, K.1
Büchi, G.2
Walker, B.H.3
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12
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0001045916
-
-
Syntheses of rac-1: a) K. Biemann, G. Büchi, B. H. Walker, J. Am. Chem. Soc. 1957, 79, 5558-5564; b) K. Tamao, S. Kodama, T. Nakatsuka, Y. Kiso, M. Kumada, J. Am. Chem. Soc. 1975, 97, 4405-4406; c) H. Saimoto, T. Hiyama, H. Nozaki, Tetrahedron Lett. 1980, 21, 3897-3898; d) F. Hadj-Abo, M. Hesse, Helv. Chim. Acta 1992, 75, 1834-1839.
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Tamao, K.1
Kodama, S.2
Nakatsuka, T.3
Kiso, Y.4
Kumada, M.5
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13
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12244291454
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Syntheses of rac-1: a) K. Biemann, G. Büchi, B. H. Walker, J. Am. Chem. Soc. 1957, 79, 5558-5564; b) K. Tamao, S. Kodama, T. Nakatsuka, Y. Kiso, M. Kumada, J. Am. Chem. Soc. 1975, 97, 4405-4406; c) H. Saimoto, T. Hiyama, H. Nozaki, Tetrahedron Lett. 1980, 21, 3897-3898; d) F. Hadj-Abo, M. Hesse, Helv. Chim. Acta 1992, 75, 1834-1839.
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Tetrahedron Lett.
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, pp. 3897-3898
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Saimoto, H.1
Hiyama, T.2
Nozaki, H.3
-
14
-
-
84987369054
-
-
Syntheses of rac-1: a) K. Biemann, G. Büchi, B. H. Walker, J. Am. Chem. Soc. 1957, 79, 5558-5564; b) K. Tamao, S. Kodama, T. Nakatsuka, Y. Kiso, M. Kumada, J. Am. Chem. Soc. 1975, 97, 4405-4406; c) H. Saimoto, T. Hiyama, H. Nozaki, Tetrahedron Lett. 1980, 21, 3897-3898; d) F. Hadj-Abo, M. Hesse, Helv. Chim. Acta 1992, 75, 1834-1839.
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Helv. Chim. Acta
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, pp. 1834-1839
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Hadj-Abo, F.1
Hesse, M.2
-
15
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0013058178
-
-
Syntheses of -(+)-1: a) K. Utimoto, S. Kato, M. Tanaka, Y. Hoshino, S. Fujikura, H. Nozaki, Heterocycles 1982, 18, 149- 152; b) H. Hagiwara, T. Katsumi, V. P. Kamat, T. Hoshi, T. Suzuki, M. Ando, J. Org. Chem. 2000, 65, 7231-7234.
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(1982)
Heterocycles
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-
Utimoto, K.1
Kato, S.2
Tanaka, M.3
Hoshino, Y.4
Fujikura, S.5
Nozaki, H.6
-
16
-
-
0034693343
-
-
Syntheses of -(+)-1: a) K. Utimoto, S. Kato, M. Tanaka, Y. Hoshino, S. Fujikura, H. Nozaki, Heterocycles 1982, 18, 149- 152; b) H. Hagiwara, T. Katsumi, V. P. Kamat, T. Hoshi, T. Suzuki, M. Ando, J. Org. Chem. 2000, 65, 7231-7234.
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J. Org. Chem.
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Hagiwara, H.1
Katsumi, T.2
Kamat, V.P.3
Hoshi, T.4
Suzuki, T.5
Ando, M.6
-
17
-
-
12244282022
-
-
Syntheses of muscopyridine isomers: a) U. K. Georgi, J. Rétey, Chem. Commun. 1971, 32-33; b) A. T. Balaban, M. Gavat, C. D. Nenitzescu, Tetrahedron 1962, 18, 1079-1081; c) P. Dubs, R. Stüssi, J. Chem. Soc. Chem. Commun. 1976. 1021.
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(1971)
Chem. Commun.
, pp. 32-33
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Georgi, U.K.1
Rétey, J.2
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18
-
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12244260952
-
-
Syntheses of muscopyridine isomers: a) U. K. Georgi, J. Rétey, Chem. Commun. 1971, 32-33; b) A. T. Balaban, M. Gavat, C. D. Nenitzescu, Tetrahedron 1962, 18, 1079-1081; c) P. Dubs, R. Stüssi, J. Chem. Soc. Chem. Commun. 1976. 1021.
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Tetrahedron
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Balaban, A.T.1
Gavat, M.2
Nenitzescu, C.D.3
-
19
-
-
37049095700
-
-
Syntheses of muscopyridine isomers: a) U. K. Georgi, J. Rétey, Chem. Commun. 1971, 32-33; b) A. T. Balaban, M. Gavat, C. D. Nenitzescu, Tetrahedron 1962, 18, 1079-1081; c) P. Dubs, R. Stüssi, J. Chem. Soc. Chem. Commun. 1976. 1021.
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J. Chem. Soc. Chem. Commun.
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-
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Dubs, P.1
Stüssi, R.2
-
20
-
-
12244256978
-
-
note
-
The synthesis described by Kumada et al. that is based on a "stitching" cross-coupling reaction is seemingly one-step; this step, however, affords only 20% yield and the preparation of the aliphatic segment in racemic form requires four additional steps, the yields of which were not specified (see footnote 10 in ref. [5b]).
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-
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21
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0001113068
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a) A. Fürstner, A. Leitner, Angew. Chem. 2002, 114, 632-635; Angew. Chem. Int. Ed. 2002, 41, 609-612;
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Angew. Chem.
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Fürstner, A.1
Leitner, A.2
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22
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0037083916
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a) A. Fürstner, A. Leitner, Angew. Chem. 2002, 114, 632-635; Angew. Chem. Int. Ed. 2002, 41, 609-612;
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(2002)
Angew. Chem. Int. Ed.
, vol.41
, pp. 609-612
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-
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23
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0037146041
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b) A. Fürstner, A. Leitner, M. Méndez, H. Krause, J. Am. Chem. Soc. 2002, 124, 13856-13863.
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J. Am. Chem. Soc.
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Fürstner, A.1
Leitner, A.2
Méndez, M.3
Krause, H.4
-
24
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0000689303
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-
For related iron-catalyzed cross-coupling reactions with alkenyl halides see, for example: a) M. Tamura, J. K. Kochi, J. Am. Chem, Soc. 1971, 93, 1487-1489; b) G. Cahiez, H. Avedissian, Synthesis 1998, 1199-1205, and references therein.
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J. Am. Chem. Soc.
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, pp. 1487-1489
-
-
Tamura, M.1
Kochi, J.K.2
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25
-
-
0031871453
-
-
and references therein
-
For related iron-catalyzed cross-coupling reactions with alkenyl halides see, for example: a) M. Tamura, J. K. Kochi, J. Am. Chem, Soc. 1971, 93, 1487-1489; b) G. Cahiez, H. Avedissian, Synthesis 1998, 1199-1205, and references therein.
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(1998)
Synthesis
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Cahiez, G.1
Avedissian, H.2
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26
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0025819708
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M. El Hadrami, J.-P. Lavergne, P. Viallefont, M. Y. A. Itto, A. Hasnaoui, Tetrahedron Lett. 1991, 32, 3985-3988.
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Tetrahedron Lett.
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El Hadrami, M.1
Lavergne, J.-P.2
Viallefont, P.3
Itto, M.Y.A.4
Hasnaoui, A.5
-
27
-
-
78249281266
-
-
Ruthenium-based metathesis catalysts are easily poisoned by amines. This problem can be circumvented by protonating the basic sites, see, for example: a) G. C. Fu, S. T. Nguyen, R. H. Grubbs, J. Am. Chem. Soc. 1993, 115, 9856-9857; b) A. Fürstner, J. Grabowski, C. W. Lehmann, J. Org. Chem. 1999, 64, 8275-8280.
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J. Am. Chem. Soc.
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, pp. 9856-9857
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Fu, G.C.1
Nguyen, S.T.2
Grubbs, R.H.3
-
28
-
-
0038590297
-
-
Ruthenium-based metathesis catalysts are easily poisoned by amines. This problem can be circumvented by protonating the basic sites, see, for example: a) G. C. Fu, S. T. Nguyen, R. H. Grubbs, J. Am. Chem. Soc. 1993, 115, 9856-9857; b) A. Fürstner, J. Grabowski, C. W. Lehmann, J. Org. Chem. 1999, 64, 8275-8280.
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(1999)
J. Org. Chem.
, vol.64
, pp. 8275-8280
-
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Fürstner, A.1
Grabowski, J.2
Lehmann, C.W.3
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29
-
-
0035914638
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-
A. Fürstner, O. Guth, A. Düffels, G. Seidel, M. Liebl, B. Gabor, R. Mynott, Chem. Eur. J. 2001, 7, 4811-4820.
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(2001)
Chem. Eur. J.
, vol.7
, pp. 4811-4820
-
-
Fürstner, A.1
Guth, O.2
Düffels, A.3
Seidel, G.4
Liebl, M.5
Gabor, B.6
Mynott, R.7
-
30
-
-
0038023350
-
-
For previous applications of this catalyst see: a) A. Fürstner, A. F. Hill, M. Liebl, J. D. E. T. Wilton-Ely, Chem. Commun. 1999, 601-602; b) A. Fürstner, O. R. Thiel, J. Org. Chem. 2000, 65, 1738-1742; c) A. Fürstner, J. Grabowski, C. W. Lehmann, T. Kataoka, K. Nagai, ChemBioChem 2001, 2, 60-68; d) A. Fürstner, K. Radkowski, Chem. Commun. 2001, 671-672; e) A. Fürstner, K. Radkowski, C. Wirtz, R. Goddard, C.W. Lehmann, R. Mynott, J. Am. Chem. Soc. 2002, 124, 7061-7069; f) A. Fürstner, F. Jeanjean, P. Razon, Angew. Chem. 2002, 114, 2203-2206; Angew. Chem. Int. Ed. 2002, 41, 2097-2101; g) A. Fürstner, M. Schlecle, Adv. Synth. Catal. 2002, 344, 657-665.
-
(1999)
Chem. Commun.
, pp. 601-602
-
-
Fürstner, A.1
Hill, A.F.2
Liebl, M.3
Wilton-Ely, J.D.E.T.4
-
31
-
-
0038644039
-
-
For previous applications of this catalyst see: a) A. Fürstner, A. F. Hill, M. Liebl, J. D. E. T. Wilton-Ely, Chem. Commun. 1999, 601-602; b) A. Fürstner, O. R. Thiel, J. Org. Chem. 2000, 65, 1738-1742; c) A. Fürstner, J. Grabowski, C. W. Lehmann, T. Kataoka, K. Nagai, ChemBioChem 2001, 2, 60-68; d) A. Fürstner, K. Radkowski, Chem. Commun. 2001, 671-672; e) A. Fürstner, K. Radkowski, C. Wirtz, R. Goddard, C.W. Lehmann, R. Mynott, J. Am. Chem. Soc. 2002, 124, 7061-7069; f) A. Fürstner, F. Jeanjean, P. Razon, Angew. Chem. 2002, 114, 2203-2206; Angew. Chem. Int. Ed. 2002, 41, 2097-2101; g) A. Fürstner, M. Schlecle, Adv. Synth. Catal. 2002, 344, 657-665.
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(2000)
J. Org. Chem.
, vol.65
, pp. 1738-1742
-
-
Fürstner, A.1
Thiel, O.R.2
-
32
-
-
0035825485
-
-
For previous applications of this catalyst see: a) A. Fürstner, A. F. Hill, M. Liebl, J. D. E. T. Wilton-Ely, Chem. Commun. 1999, 601-602; b) A. Fürstner, O. R. Thiel, J. Org. Chem. 2000, 65, 1738-1742; c) A. Fürstner, J. Grabowski, C. W. Lehmann, T. Kataoka, K. Nagai, ChemBioChem 2001, 2, 60-68; d) A. Fürstner, K. Radkowski, Chem. Commun. 2001, 671-672; e) A. Fürstner, K. Radkowski, C. Wirtz, R. Goddard, C.W. Lehmann, R. Mynott, J. Am. Chem. Soc. 2002, 124, 7061-7069; f) A. Fürstner, F. Jeanjean, P. Razon, Angew. Chem. 2002, 114, 2203-2206; Angew. Chem. Int. Ed. 2002, 41, 2097-2101; g) A. Fürstner, M. Schlecle, Adv. Synth. Catal. 2002, 344, 657-665.
-
(2001)
ChemBioChem
, vol.2
, pp. 60-68
-
-
Fürstner, A.1
Grabowski, J.2
Lehmann, C.W.3
Kataoka, T.4
Nagai, K.5
-
33
-
-
0035820340
-
-
For previous applications of this catalyst see: a) A. Fürstner, A. F. Hill, M. Liebl, J. D. E. T. Wilton-Ely, Chem. Commun. 1999, 601-602; b) A. Fürstner, O. R. Thiel, J. Org. Chem. 2000, 65, 1738-1742; c) A. Fürstner, J. Grabowski, C. W. Lehmann, T. Kataoka, K. Nagai, ChemBioChem 2001, 2, 60-68; d) A. Fürstner, K. Radkowski, Chem. Commun. 2001, 671-672; e) A. Fürstner, K. Radkowski, C. Wirtz, R. Goddard, C.W. Lehmann, R. Mynott, J. Am. Chem. Soc. 2002, 124, 7061-7069; f) A. Fürstner, F. Jeanjean, P. Razon, Angew. Chem. 2002, 114, 2203-2206; Angew. Chem. Int. Ed. 2002, 41, 2097-2101; g) A. Fürstner, M. Schlecle, Adv. Synth. Catal. 2002, 344, 657-665.
-
(2001)
Chem. Commun.
, pp. 671-672
-
-
Fürstner, A.1
Radkowski, K.2
-
34
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0037134804
-
-
For previous applications of this catalyst see: a) A. Fürstner, A. F. Hill, M. Liebl, J. D. E. T. Wilton-Ely, Chem. Commun. 1999, 601-602; b) A. Fürstner, O. R. Thiel, J. Org. Chem. 2000, 65, 1738-1742; c) A. Fürstner, J. Grabowski, C. W. Lehmann, T. Kataoka, K. Nagai, ChemBioChem 2001, 2, 60-68; d) A. Fürstner, K. Radkowski, Chem. Commun. 2001, 671-672; e) A. Fürstner, K. Radkowski, C. Wirtz, R. Goddard, C.W. Lehmann, R. Mynott, J. Am. Chem. Soc. 2002, 124, 7061-7069; f) A. Fürstner, F. Jeanjean, P. Razon, Angew. Chem. 2002, 114, 2203-2206; Angew. Chem. Int. Ed. 2002, 41, 2097-2101; g) A. Fürstner, M. Schlecle, Adv. Synth. Catal. 2002, 344, 657-665.
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(2002)
J. Am. Chem. Soc.
, vol.124
, pp. 7061-7069
-
-
Fürstner, A.1
Radkowski, K.2
Wirtz, C.3
Goddard, R.4
Lehmann, C.W.5
Mynott, R.6
-
35
-
-
4243646116
-
-
For previous applications of this catalyst see: a) A. Fürstner, A. F. Hill, M. Liebl, J. D. E. T. Wilton-Ely, Chem. Commun. 1999, 601-602; b) A. Fürstner, O. R. Thiel, J. Org. Chem. 2000, 65, 1738-1742; c) A. Fürstner, J. Grabowski, C. W. Lehmann, T. Kataoka, K. Nagai, ChemBioChem 2001, 2, 60-68; d) A. Fürstner, K. Radkowski, Chem. Commun. 2001, 671-672; e) A. Fürstner, K. Radkowski, C. Wirtz, R. Goddard, C.W. Lehmann, R. Mynott, J. Am. Chem. Soc. 2002, 124, 7061-7069; f) A. Fürstner, F. Jeanjean, P. Razon, Angew. Chem. 2002, 114, 2203-2206; Angew. Chem. Int. Ed. 2002, 41, 2097-2101; g) A. Fürstner, M. Schlecle, Adv. Synth. Catal. 2002, 344, 657-665.
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(2002)
Angew. Chem.
, vol.114
, pp. 2203-2206
-
-
Fürstner, A.1
Jeanjean, F.2
Razon, P.3
-
36
-
-
0037124686
-
-
For previous applications of this catalyst see: a) A. Fürstner, A. F. Hill, M. Liebl, J. D. E. T. Wilton-Ely, Chem. Commun. 1999, 601-602; b) A. Fürstner, O. R. Thiel, J. Org. Chem. 2000, 65, 1738-1742; c) A. Fürstner, J. Grabowski, C. W. Lehmann, T. Kataoka, K. Nagai, ChemBioChem 2001, 2, 60-68; d) A. Fürstner, K. Radkowski, Chem. Commun. 2001, 671-672; e) A. Fürstner, K. Radkowski, C. Wirtz, R. Goddard, C.W. Lehmann, R. Mynott, J. Am. Chem. Soc. 2002, 124, 7061-7069; f) A. Fürstner, F. Jeanjean, P. Razon, Angew. Chem. 2002, 114, 2203-2206; Angew. Chem. Int. Ed. 2002, 41, 2097-2101; g) A. Fürstner, M. Schlecle, Adv. Synth. Catal. 2002, 344, 657-665.
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(2002)
Angew. Chem. Int. Ed.
, vol.41
, pp. 2097-2101
-
-
-
37
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0346171216
-
-
For previous applications of this catalyst see: a) A. Fürstner, A. F. Hill, M. Liebl, J. D. E. T. Wilton-Ely, Chem. Commun. 1999, 601-602; b) A. Fürstner, O. R. Thiel, J. Org. Chem. 2000, 65, 1738-1742; c) A. Fürstner, J. Grabowski, C. W. Lehmann, T. Kataoka, K. Nagai, ChemBioChem 2001, 2, 60-68; d) A. Fürstner, K. Radkowski, Chem. Commun. 2001, 671-672; e) A. Fürstner, K. Radkowski, C. Wirtz, R. Goddard, C.W. Lehmann, R. Mynott, J. Am. Chem. Soc. 2002, 124, 7061-7069; f) A. Fürstner, F. Jeanjean, P. Razon, Angew. Chem. 2002, 114, 2203-2206; Angew. Chem. Int. Ed. 2002, 41, 2097-2101; g) A. Fürstner, M. Schlecle, Adv. Synth. Catal. 2002, 344, 657-665.
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Adv. Synth. Catal.
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, pp. 657-665
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Schlecle, M.2
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b) A. Fürstner, Angew. Chem. 2000,112, 3140-3172; Angew. Chem. Int. Ed. 2000, 39, 3012-3043;
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Angew. Chem.
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b) A. Fürstner, Angew. Chem. 2000,112, 3140-3172; Angew. Chem. Int. Ed. 2000, 39, 3012-3043;
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Angew. Chem. Int. Ed.
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c) M. Schuster, S. Blechert, Angew. Chem. 1997, 109, 2124-2144; Angew. Chem. Int. Ed. Engl. 1997, 36, 2037-2056.
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c) M. Schuster, S. Blechert, Angew. Chem. 1997, 109, 2124-2144; Angew. Chem. Int. Ed. Engl. 1997, 36, 2037-2056.
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43
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70349913659
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In contrast, macrocyclic alkenes are not inert to the more active "second-generation" ruthenium catalysts. While in the present case this leads to undesirable polymerization, it is possible to use this ability to advantage: a) A. B. Smith, C. M. Adams, S. A. Kozmin, J. Am. Chem. Soc. 2001, 123, 990-991; b) A. Fürstner, O. R. Thiel, L. Ackermann, Org. Lett. 2001, 3, 449-451; c) C. W. Lee, R.H. Grubbs, Org. Lett. 2000, 2, 2145-2147; d) A. Fürstner, O. R. Thiel, N. Kindler, B. Bartkowska, J. Org. Chem. 2000, 65, 7990-7995.
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0035825762
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In contrast, macrocyclic alkenes are not inert to the more active "second-generation" ruthenium catalysts. While in the present case this leads to undesirable polymerization, it is possible to use this ability to advantage: a) A. B. Smith, C. M. Adams, S. A. Kozmin, J. Am. Chem. Soc. 2001, 123, 990-991; b) A. Fürstner, O. R. Thiel, L. Ackermann, Org. Lett. 2001, 3, 449-451; c) C. W. Lee, R.H. Grubbs, Org. Lett. 2000, 2, 2145-2147; d) A. Fürstner, O. R. Thiel, N. Kindler, B. Bartkowska, J. Org. Chem. 2000, 65, 7990-7995.
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In contrast, macrocyclic alkenes are not inert to the more active "second-generation" ruthenium catalysts. While in the present case this leads to undesirable polymerization, it is possible to use this ability to advantage: a) A. B. Smith, C. M. Adams, S. A. Kozmin, J. Am. Chem. Soc. 2001, 123, 990-991; b) A. Fürstner, O. R. Thiel, L. Ackermann, Org. Lett. 2001, 3, 449-451; c) C. W. Lee, R.H. Grubbs, Org. Lett. 2000, 2, 2145-2147; d) A. Fürstner, O. R. Thiel, N. Kindler, B. Bartkowska, J. Org. Chem. 2000, 65, 7990-7995.
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In contrast, macrocyclic alkenes are not inert to the more active "second-generation" ruthenium catalysts. While in the present case this leads to undesirable polymerization, it is possible to use this ability to advantage: a) A. B. Smith, C. M. Adams, S. A. Kozmin, J. Am. Chem. Soc. 2001, 123, 990-991; b) A. Fürstner, O. R. Thiel, L. Ackermann, Org. Lett. 2001, 3, 449-451; c) C. W. Lee, R.H. Grubbs, Org. Lett. 2000, 2, 2145-2147; d) A. Fürstner, O. R. Thiel, N. Kindler, B. Bartkowska, J. Org. Chem. 2000, 65, 7990-7995.
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For previous examples of tandem RCM/hydrogenation catalysis by ruthenium-carbene complexes see: a) A. Fürstner, K. Langemann, N. Kindler Studiengesellschaft Kohle mbH. US Patent 5, 936, 100 1999 (priority December 16, 1996); b) J. Louie, C. W. Bielawski, R. H. Grubbs, J. Am. Chem. Soc. 2001, 123, 11312-11313.
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For previous examples of tandem RCM/hydrogenation catalysis by ruthenium-carbene complexes see: a) A. Fürstner, K. Langemann, N. Kindler Studiengesellschaft Kohle mbH. US Patent 5, 936, 100 1999 (priority December 16, 1996); b) J. Louie, C. W. Bielawski, R. H. Grubbs, J. Am. Chem. Soc. 2001, 123, 11312-11313.
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Insertion of Mg into commercial 6-bromo-1-hexene is accompanied by partial cyclization to give (cyclopentylmethyl)magnesium bromide in addition to the desired 5-hexenylmagnesium bromide, see D. Lal, D. Griller, S. Husband, K. U. Ingold, J. Am. Chem. Soc. 1974, 96. 6355-6357. The side products resulting thereof are easily eliminated by flash chromatography and the yield of 14 refers to analytically pure product.
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