-
3
-
-
0035913732
-
-
Total synthesis: a P. Bernadelli, O. M. Moradei, D. Friedrich, J. Yang, F. Gallou, B. P. Dyck, R. W. Doskotch, T. Lange, L. A. Paquette, J. Am. Chem. Soc. 2001, 123, 9021-9032;
-
Total synthesis: a) P. Bernadelli, O. M. Moradei, D. Friedrich, J. Yang, F. Gallou, B. P. Dyck, R. W. Doskotch, T. Lange, L. A. Paquette, J. Am. Chem. Soc. 2001, 123, 9021-9032;
-
-
-
-
4
-
-
0035913709
-
-
b) D. W. C. MacMillan, L. E. Overman, L. D. Pennington, J. Am. Chem. Soc. 2001, 123, 9033-9044.
-
(2001)
J. Am. Chem. Soc
, vol.123
, pp. 9033-9044
-
-
MacMillan, D.W.C.1
Overman, L.E.2
Pennington, L.D.3
-
5
-
-
0038547883
-
-
Total synthesis: O. Corminboeuf, L. E. Overman, L. D. Pennington, J. Am. Chem. Soc. 2003, 125, 6650-6652.
-
Total synthesis: O. Corminboeuf, L. E. Overman, L. D. Pennington, J. Am. Chem. Soc. 2003, 125, 6650-6652.
-
-
-
-
8
-
-
0042229312
-
-
c) Y. Chai, D. A. Vicic, M. C. McIntosh, Org. Lett. 2003, 5, 1039-1042;
-
(2003)
Org. Lett
, vol.5
, pp. 1039-1042
-
-
Chai, Y.1
Vicic, D.A.2
McIntosh, M.C.3
-
9
-
-
24944507270
-
-
d) T. Akindele, S. P. Marsden, J. G. Cumming, Tetrahedron Lett. 2005, 46, 7235-7238.
-
(2005)
Tetrahedron Lett
, vol.46
, pp. 7235-7238
-
-
Akindele, T.1
Marsden, S.P.2
Cumming, J.G.3
-
10
-
-
34447542845
-
-
preceding article
-
J. Becker, R. Fröhlich, K. Salorinne, D. Hoppe, Eur. J. Org. Chem. 2007, 3337-3348, preceding article.
-
(2007)
Eur. J. Org. Chem
, pp. 3337-3348
-
-
Becker, J.1
Fröhlich, R.2
Salorinne, K.3
Hoppe, D.4
-
11
-
-
34447534118
-
-
J. Becker, S. Grimme, R. Fröhlich, D. Hoppe, Angew. Chem. 2007, 119, 1672-1676;
-
(2007)
Angew. Chem
, vol.119
, pp. 1672-1676
-
-
Becker, J.1
Grimme, S.2
Fröhlich, R.3
Hoppe, D.4
-
12
-
-
34248226223
-
-
Angew. Chem. Int. Ed. 2007, 46, 1645-1649.
-
(2007)
Chem. Int. Ed
, vol.46
, pp. 1645-1649
-
-
Angew1
-
13
-
-
0000854142
-
-
For reviews, see: a
-
For reviews, see: a) D. Hoppe, T. Hense, Angew. Chem. 1997, 109, 2376-2410;
-
(1997)
Angew. Chem
, vol.109
, pp. 2376-2410
-
-
Hoppe, D.1
Hense, T.2
-
16
-
-
0037585195
-
Organolithiums in Enantioselective Synthesis
-
Ed, D. M. Hodgson, Springer, Berlin
-
c) D. Hoppe, F. Marr, M. Brüggemann, Organolithiums in Enantioselective Synthesis in Top. Organomet. Chem. (Ed.: D. M. Hodgson), Springer, Berlin, 2003, vol. 5, pp. 61-138;
-
(2003)
Top. Organomet. Chem
, vol.5
, pp. 61-138
-
-
Hoppe, D.1
Marr, F.2
Brüggemann, M.3
-
17
-
-
0842300569
-
Organolithiums in Enantioselective Synthesis
-
Ed, D. M. Hodgson, Springer, Berlin
-
d) P. Beak, T. A. Johnson, D. D. Kim, S. H. Lim, Organolithiums in Enantioselective Synthesis in Top. Organomet. Chem. (Ed.: D. M. Hodgson), Springer, Berlin, 2003, vol. 5, pp. 139-176;
-
(2003)
Top. Organomet. Chem
, vol.5
, pp. 139-176
-
-
Beak, P.1
Johnson, T.A.2
Kim, D.D.3
Lim, S.H.4
-
18
-
-
18844423506
-
-
Eds, Z. Rappoport, I. Marek, Wiley, Chichester
-
e) D. Hoppe, G. Christoph in The Chemistry of Organolithium Compounds (Eds.: Z. Rappoport, I. Marek), Wiley, Chichester, 2004, vol. 2, pp. 1055-1164.
-
(2004)
The Chemistry of Organolithium Compounds
, vol.2
, pp. 1055-1164
-
-
Hoppe, D.1
Christoph, G.2
-
19
-
-
0000928950
-
-
a) D. Hoppe, T. Krämer, C. Freire Erdbrügger, E. Egert, Tetrahedron Lett. 1989, 30, 1233-1236;
-
(1989)
Tetrahedron Lett
, vol.30
, pp. 1233-1236
-
-
Hoppe, D.1
Krämer, T.2
Freire Erdbrügger, C.3
Egert, E.4
-
20
-
-
27544464237
-
-
b) S. Ünaldi, M. Özlügedik, R. Fröhlich, D. Hoppe, Adv. Synth. Catal. 2005, 347, 1621-1626.
-
(2005)
Adv. Synth. Catal
, vol.347
, pp. 1621-1626
-
-
Ünaldi, S.1
Özlügedik, M.2
Fröhlich, R.3
Hoppe, D.4
-
21
-
-
0000898481
-
-
D. Hoppe, R. Hanko, A. Brönneke, F. Lichtenberg, E. van Hülsen, Chem. Ber. 1985, 118, 2822-2851.
-
(1985)
Chem. Ber
, vol.118
, pp. 2822-2851
-
-
Hoppe, D.1
Hanko, R.2
Brönneke, A.3
Lichtenberg, F.4
van Hülsen, E.5
-
23
-
-
0037130642
-
-
Synthesis of enantiomerically pure (R)-(-)-crypton: a) J. Evarts, E. Torres, P. L. Fuchs, J. Am. Chem. Soc. 2002, 124, 11093-11101;
-
Synthesis of enantiomerically pure (R)-(-)-crypton: a) J. Evarts, E. Torres, P. L. Fuchs, J. Am. Chem. Soc. 2002, 124, 11093-11101;
-
-
-
-
24
-
-
0042179715
-
-
rac-crypton (<5% ee) from nopinon and reduction: b) J. M. Coxon, G. J. Hydes, P. J. Steel, Tetrahedron 1985, 41, 5213-5217;
-
rac-crypton (<5% ee) from nopinon and reduction: b) J. M. Coxon, G. J. Hydes, P. J. Steel, Tetrahedron 1985, 41, 5213-5217;
-
-
-
-
25
-
-
0025309685
-
-
c) H. C. Brown, S. A. Weissman, P. T. Perumal, U. P. Dhokte, J. Org. Chem. 1990, 55, 1217-1223.
-
(1990)
J. Org. Chem
, vol.55
, pp. 1217-1223
-
-
Brown, H.C.1
Weissman, S.A.2
Perumal, P.T.3
Dhokte, U.P.4
-
26
-
-
34447506982
-
-
Data sets were collected with an Enraf-Nonius CAD4 and a Nonius KappaCCD diffractometers. Programs used: data collection EXPRESS (Nonius B. V., 1994) and COLLECT (Nonius B. V., 1998), data reduction MolEN (K. Fair, Enraf-Nonius B. V., 1990) and Denzo-SMN (Z. Otwinowski, W. Minor, Methods in Enzymology, 1997, 276, 307-326),
-
Data sets were collected with an Enraf-Nonius CAD4 and a Nonius KappaCCD diffractometers. Programs used: data collection EXPRESS (Nonius B. V., 1994) and COLLECT (Nonius B. V., 1998), data reduction MolEN (K. Fair, Enraf-Nonius B. V., 1990) and Denzo-SMN (Z. Otwinowski, W. Minor, Methods in Enzymology, 1997, 276, 307-326),
-
-
-
-
27
-
-
0038414570
-
-
absorption correction Denzo (Z. Otwinowski, D. Borek, W. Majewski, W. Minor, Acta Crystallogr. Ser. A 2003, 59, 228-234),
-
absorption correction Denzo (Z. Otwinowski, D. Borek, W. Majewski, W. Minor, Acta Crystallogr. Ser. A 2003, 59, 228-234),
-
-
-
-
28
-
-
84943920736
-
-
structure solution SHELXS-97 (G. M. Sheldrick, Acta Crystallogr. Ser. A 1990, 46, 467-473), structure refinement SHELXL-97 (G. M. Sheldrick, University of Göttingen, 1997), graphics SCHAKAL (E. Keller, University of Freiburg, 1997). CCDC-639288 to -639292 contain the supplementary crystallographic data for this paper. These data can be obtained free of charge from The Cambridge Crystallographic Data Centre via www.ccdc.cam.ac.uk/ data_request/cif.
-
structure solution SHELXS-97 (G. M. Sheldrick, Acta Crystallogr. Ser. A 1990, 46, 467-473), structure refinement SHELXL-97 (G. M. Sheldrick, University of Göttingen, 1997), graphics SCHAKAL (E. Keller, University of Freiburg, 1997). CCDC-639288 to -639292 contain the supplementary crystallographic data for this paper. These data can be obtained free of charge from The Cambridge Crystallographic Data Centre via www.ccdc.cam.ac.uk/ data_request/cif.
-
-
-
-
29
-
-
34447504278
-
-
X-ray crystal structure analysis for 11b: formula C 30H39NO3, M, 461.62, colorless crystal 0.45 x 0.20 x 0.20 mm, a, 7.728(1, b, 10.606(1, c, 32.505(4) Å, V, 2664.2(5) Å3, ρcalc, 1.151 g cm-3, μ, 0.572 mm-1, empirical absorption correction (0.783 ≤ T ≤ 0.894, Z, 4, orthorhombic, space group P212121 (No. 19, λ, 1.54178 Å, T, 223 K, ω/2θ scans, 3121 reflections collected, h, k, l, sin9)/λ, 0.62 Å-1, 3121 independent and 2227 observed reflections [I ≥ 2 σ(I, 315 refined parameters, R, 0.048, wR2, 0.145, Flack parameter 0.1(5, max. residual electron density 0.21, 0.20) e Å-3, hydrogen atoms calculated and refined as riding atoms
-
-3, hydrogen atoms calculated and refined as riding atoms.
-
-
-
-
30
-
-
12344264925
-
-
P. Razon, S. Dhulut, S. Bezzenine-Lafollée, J. Courtieu, A. Pancrazi, J. Ardisson, Synthesis 2005, 102-108;
-
(2005)
Synthesis
, pp. 102-108
-
-
Razon, P.1
Dhulut, S.2
Bezzenine-Lafollée, S.3
Courtieu, J.4
Pancrazi, A.5
Ardisson, J.6
-
31
-
-
12344297631
-
-
P. Razon, M.-A. N'Zoutani, S. Dhulut, S. Bezzenine-Lafollée, A. Pancrazi, J. Ardisson, Synthesis 2005, 109-121.
-
(2005)
Synthesis
, pp. 109-121
-
-
Razon, P.1
N'Zoutani, M.-A.2
Dhulut, S.3
Bezzenine-Lafollée, S.4
Pancrazi, A.5
Ardisson, J.6
-
34
-
-
0242632891
-
-
Ed, M. Schlosser, Wiley-VCH, Chichester, 2nd ed, pp
-
b) M. T. Reetz in Organometallics in Synthesis (Ed.: M. Schlosser), Wiley-VCH, Chichester, 2002, 2nd ed., pp. 817-923;
-
(2002)
Organometallics in Synthesis
, pp. 817-923
-
-
Reetz, M.T.1
-
37
-
-
0030951974
-
-
S. Hikichi, Y. Gao, F. Sato, Tetrahedron Lett. 1997, 38, 2867-2870.
-
(1997)
Tetrahedron Lett
, vol.38
, pp. 2867-2870
-
-
Hikichi, S.1
Gao, Y.2
Sato, F.3
-
38
-
-
0000945611
-
-
a) Y. Yamamoto, S. Nishii, K. Maruyama, T. Komatsu, W. Ito, J. Am. Chem. Soc. 1986, 108, 7778;
-
(1986)
J. Am. Chem. Soc
, vol.108
, pp. 7778
-
-
Yamamoto, Y.1
Nishii, S.2
Maruyama, K.3
Komatsu, T.4
Ito, W.5
-
40
-
-
0029153281
-
-
J. Szymoniak, H. Lefranc, J. Besancon, C. Moïse, Synthesis 1995, 815-819.
-
(1995)
Synthesis
, pp. 815-819
-
-
Szymoniak, J.1
Lefranc, H.2
Besancon, J.3
Moïse, C.4
-
41
-
-
34447505434
-
-
A boat-like transition state in which the substituent R occupies an equatorial position would lead to eclipsed interactions with the y-substituents of the allyl carbamate. The chair-like transition states TS-16 and TS-29 explain, why the yields of the homoaldol reactions with sterically demanding alkanals in contrast to arylic aldehydes are better for 3 than for β-methyl-substituted carbamate 2, where the 1,3-diaxial interactions are much larger.
-
A boat-like transition state in which the substituent R occupies an equatorial position would lead to eclipsed interactions with the y-substituents of the allyl carbamate. The chair-like transition states TS-16 and TS-29 explain, why the yields of the homoaldol reactions with sterically demanding alkanals in contrast to arylic aldehydes are better for 3 than for β-methyl-substituted carbamate 2, where the 1,3-diaxial interactions are much larger.
-
-
-
-
42
-
-
0001153549
-
-
A boat-like transition state was proposed for several titanium-mediated aldol reactions with persubstituted enolates, see: a S. Yamago, D. Machii, E. Nakamura, J. Org. Chem. 1991, 56, 2098-2106;
-
A boat-like transition state was proposed for several titanium-mediated aldol reactions with persubstituted enolates, see: a) S. Yamago, D. Machii, E. Nakamura, J. Org. Chem. 1991, 56, 2098-2106;
-
-
-
-
44
-
-
34447525931
-
-
Diploma Thesis, University of Münster
-
J. Becker, Diploma Thesis, University of Münster, 2005.
-
(2005)
-
-
Becker, J.1
-
45
-
-
0011229374
-
-
For the reversal of anti to syn diastereoselectivity in a) crotyltitanium or b) tiglyltitanocene reactions, see: a J. Szymoniak, N. Thery, C. Moïse, Synlett 1997, 1239-1240;
-
For the reversal of anti to syn diastereoselectivity in a) crotyltitanium or b) tiglyltitanocene reactions, see: a) J. Szymoniak, N. Thery, C. Moïse, Synlett 1997, 1239-1240;
-
-
-
-
46
-
-
2342486512
-
-
b) J. Szymoniak, N. Thery, C. Moïse, Bull. Soc. Chim. Fr. 1997, 134, 85-91.
-
(1997)
Bull. Soc. Chim. Fr
, vol.134
, pp. 85-91
-
-
Szymoniak, J.1
Thery, N.2
Moïse, C.3
-
47
-
-
34447524389
-
-
X-ray crystal structure analysis for rac-31a: formula C23H35NO3, M, 373.52, colorless crystal 0.50 x 0.25 x 0.05 mm, a, 11.395(1, b, 18.803(6, c, 10.359(1) Å, V, 2219.5(3) Å3, ρcalc, 1.118 g cm-3, μ, 0.572 mm-1, empirical absorption correction (0.763 ≤ T ≤ 0.972, Z, 4, orthorhombic, space group P212121 (No. 19, λ, 1.54178 Å, T, 223 K, ω and φ scans, 9789 reflections collected (±h, ±k, ±l, sinθ)/λ, 0.60 Å-1, 3647 independent (Rint, 0.041) and 3346 observed reflections [I ≥ 2 σ(I, 251 refined parameters, R, 0.049, wR 2, 0.133, Flack parameter 0.5(3, max. residual electron density 0.12, 0.15) e A
-
-3, hydrogen atoms calculated and refined as riding atoms.
-
-
-
-
48
-
-
0033601294
-
-
U. Chiacchio, A. Corsaro, G. Gumina, A. Rescifina, D. Iannazzo, A. Piperno, G. Romeo, R. Romeo, J. Org. Chem. 1999, 64, 9321-9327.
-
(1999)
J. Org. Chem
, vol.64
, pp. 9321-9327
-
-
Chiacchio, U.1
Corsaro, A.2
Gumina, G.3
Rescifina, A.4
Iannazzo, D.5
Piperno, A.6
Romeo, G.7
Romeo, R.8
-
49
-
-
34447506980
-
-
X-ray crystal structure analysis for 38a: formula C 28H28O2, M, 396.50, colorless crystal 0.55 x 0.15 x 0.06 mm, a, 8.811(1, b, 12.110(1, c, 11.188(1) Å, β, 110.23(1)°, V, 1120.1(2) Å3, ρcalc, 1.176 g cm-3, μ, 0.561 mm-1, empirical absorption correction (0.748 ≤ T ≤ 0.967, Z, 2, monoclinic, space group P21 (No. 4, λ, 1.54178 Å, T, 223 K, ω and ρ scans, 11166 reflections collected (±h, ±k, ±l, sinθ)/λ, 0.58 Å-1, 2749 independent (Rint, 0.051) and 2409 observed reflections [I ≥ 2σ(I, 273 refined parameters, R, 0.041, wR 2, 0.110, Flack parameter -0.2(4, max. residual electron density 0.10, 0.11) e Å-3
-
-3, hydrogen atoms calculated and refined as riding atoms.
-
-
-
-
50
-
-
34447540638
-
-
X-ray crystal structure analysis for 41a: formula C 23H25BrO2, M, 413.34, colorless crystal 0.45 x 0.10 x 0.10 mm, a, 11.838(1, b, 5.945(1, c, 14.515(1) Å, β, 98.72(1)°, V, 1009.7(2) Å3, ρcalc, 1.360 g cm-3, μ, 2.871 mm-1, empirical absorption correction (0.358 ≤ T ≤ 0.761, Z, 2, monoclinic, space group P21 (No. 4, λ, 1.54178 Å, T, 223 K, ω and ρ scans, 6521 reflections collected (±h, ±k, ±l, sinθ)/λ, 0.60 Å-1, 2642 independent (Rint, 0.036) and 2560 observed reflections [I ≥ 2σ(I, 237 refined parameters, R, 0.038, wR 2, 0.101, Flack parameter 0.07(2, max. residual electron density 0.32, 0.45) e Å-3
-
-3, hydrogen atoms calculated and refined as riding atoms.
-
-
-
-
51
-
-
34447501296
-
-
The relative configuration of rac-41a, which crystallizes in a different space group than 41a, was also determined by X-ray crystal structure analysis: formula C23H25BrO2, M, 413.34, colorless crystal 0.35 x 0.25 x 0.10 mm, a, 38.648(1, b, 11.462(6, c, 17.901(1) Å, V, 7929.8(8) Å3, ρcalc, 1.385 g cm-3, μ, 2.924 mm-1, empirical absorption correction (0.428 ≤ T ≤ 0.759, Z, 16, orthorhombic, space group Fdd2 (No. 43, λ, 1.54178 Å, T, 223 K, ω and φ scans, 8967 reflections collected (±h, ±k, ±l, sinθ)/λ, 0.60 Å-1, 3251 independent (Rint, 0.033) and 3226 observed reflections [I ≥ 2σI, 238 refined parameters, R, 0.028, wR 2, 0
-
-3, hydrogen atoms calculated and refined as riding atoms.
-
-
-
-
53
-
-
34447544963
-
-
Besides the pure diastereomers, fractions of diastereomeric mixtures where obtained, which were separated by repeated chromatography
-
Besides the pure diastereomers, fractions of diastereomeric mixtures where obtained, which were separated by repeated chromatography.
-
-
-
-
54
-
-
34447540639
-
-
The diastereomeric ratio was determined from the crude products by GC (HP-5).
-
The diastereomeric ratio was determined from the crude products by GC (HP-5).
-
-
-
-
55
-
-
34447538768
-
-
The concentration of the carbamate solution is critical for good yields. 1.3 equiv. sBuLi can be used in small scale reactions (0.25 mmol), at scales of ≥ 1.0 mmol 1.0 to 1.05 equiv. of carefully titrated sBuLi and rac-26 are recommended for optimum yields.
-
The concentration of the carbamate solution is critical for good yields. 1.3 equiv. sBuLi can be used in small scale reactions (0.25 mmol), at scales of ≥ 1.0 mmol 1.0 to 1.05 equiv. of carefully titrated sBuLi and rac-26 are recommended for optimum yields.
-
-
-
|