-
2
-
-
0000311605
-
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b) first example for an enantioenriched chiral lithioallyl carbamate: D. Hoppe, T. Krämer, Angew. Chem. 1986, 98, 171-113; Angew. Int. Ed. Engl. 1986, 25, 160-162.
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Angew. Chem.
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Hoppe, D.1
Krämer, T.2
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3
-
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0347674723
-
-
b) first example for an enantioenriched chiral lithioallyl carbamate: D. Hoppe, T. Krämer, Angew. Chem. 1986, 98, 171-113; Angew. Int. Ed. Engl. 1986, 25, 160-162.
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(1986)
Angew. Int. Ed. Engl.
, vol.25
, pp. 160-162
-
-
-
4
-
-
0000854142
-
-
For reviews, see: a) D. Hoppe, T. Hense, Angew. Chem. 1997, 109, 2376-2410; Angew. Chem. Int. Ed. Engl. 1997, 36, 2282-2316;
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Angew. Chem.
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Hoppe, D.1
Hense, T.2
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5
-
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0030694010
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For reviews, see: a) D. Hoppe, T. Hense, Angew. Chem. 1997, 109, 2376-2410; Angew. Chem. Int. Ed. Engl. 1997, 36, 2282-2316;
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(1997)
Angew. Chem. Int. Ed. Engl.
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-
-
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6
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0000679903
-
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b) P. Beak, A. Basu, D. J. Gallagher, Y. S. Park, S. Thayumanavan, Acc. Chem. Res. 1996, 29, 552-560;
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Acc. Chem. Res.
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Beak, P.1
Basu, A.2
Gallagher, D.J.3
Park, Y.S.4
Thayumanavan, S.5
-
7
-
-
0000400389
-
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V. K. Aggarwal, Angew. Chem. 1994, 106, 185-187; Angew. Chem. Int. Ed. Engl. 1994, 33, 175-177;
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Angew. Chem.
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Aggarwal, V.K.1
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8
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33748244146
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V. K. Aggarwal, Angew. Chem. 1994, 106, 185-187; Angew. Chem. Int. Ed. Engl. 1994, 33, 175-177;
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(1994)
Angew. Chem. Int. Ed. Engl.
, vol.33
, pp. 175-177
-
-
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10
-
-
0001488536
-
-
a) D. Hoppe, F. Hintze, P. Tebben, Angew. Chem. 1990, 65, 1457-1459; Angew. Chem. Int. Ed. Engl. 1990, 29, 1422-1423;
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(1990)
Angew. Chem.
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Hoppe, D.1
Hintze, F.2
Tebben, P.3
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11
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-
0343583098
-
-
a) D. Hoppe, F. Hintze, P. Tebben, Angew. Chem. 1990, 65, 1457-1459; Angew. Chem. Int. Ed. Engl. 1990, 29, 1422-1423;
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(1990)
Angew. Chem. Int. Ed. Engl.
, vol.29
, pp. 1422-1423
-
-
-
14
-
-
0000920450
-
-
P. Beak, S. T. Kerrick, S. Wu, J. Chu, J. Am. Chem. Soc. 1994, 116, 3231-3239.
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(1994)
J. Am. Chem. Soc.
, vol.116
, pp. 3231-3239
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-
Beak, P.1
Kerrick, S.T.2
Wu, S.3
Chu, J.4
-
15
-
-
0001144369
-
-
a) O. Zschage, J.-R. Schwark, D. Hoppe, Angew. Chem. 1990, 102, 336-337; Angew. Chem. Int. Ed. Engl. 1990, 29, 296-297;
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(1990)
Angew. Chem.
, vol.102
, pp. 336-337
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-
Zschage, O.1
Schwark, J.-R.2
Hoppe, D.3
-
16
-
-
0025309871
-
-
a) O. Zschage, J.-R. Schwark, D. Hoppe, Angew. Chem. 1990, 102, 336-337; Angew. Chem. Int. Ed. Engl. 1990, 29, 296-297;
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(1990)
Angew. Chem. Int. Ed. Engl.
, vol.29
, pp. 296-297
-
-
-
18
-
-
0031468512
-
-
N. C. Faibish, Y. S. Park, S. Lee, P. Beak, J. Am. Chem. Soc. 1997, 119, 11561-11570;
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(1997)
J. Am. Chem. Soc.
, vol.119
, pp. 11561-11570
-
-
Faibish, N.C.1
Park, Y.S.2
Lee, S.3
Beak, P.4
-
19
-
-
0000308279
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-
D. J. Pippel, G. A. Weisenburger, S. R. Wilson, P. Beak, Angew. Chem. 1998, 110, 2600-2602; Angew. Chem. Int. Ed. 1998, 37, 2522-2524.
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Angew. Chem.
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, pp. 2600-2602
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-
Pippel, D.J.1
Weisenburger, G.A.2
Wilson, S.R.3
Beak, P.4
-
20
-
-
0032476136
-
-
D. J. Pippel, G. A. Weisenburger, S. R. Wilson, P. Beak, Angew. Chem. 1998, 110, 2600-2602; Angew. Chem. Int. Ed. 1998, 37, 2522-2524.
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(1998)
Angew. Chem. Int. Ed.
, vol.37
, pp. 2522-2524
-
-
-
21
-
-
0347044038
-
-
note
-
Here, stereoinversion is assumed to occur.
-
-
-
-
23
-
-
0001854238
-
-
High enantioenrichements have been achieved by this technique, for examples, see: a) D. Hoppe, O. Zschage, Angew. Chem. 1989, 101, 67-69; Angew. Chem. Int. Ed. Engl. 1989, 28, 69-71;
-
(1989)
Angew. Chem.
, vol.101
, pp. 67-69
-
-
Hoppe, D.1
Zschage, O.2
-
24
-
-
0003176096
-
-
High enantioenrichements have been achieved by this technique, for examples, see: a) D. Hoppe, O. Zschage, Angew. Chem. 1989, 101, 67-69; Angew. Chem. Int. Ed. Engl. 1989, 28, 69-71;
-
(1989)
Angew. Chem. Int. Ed. Engl.
, vol.28
, pp. 69-71
-
-
-
27
-
-
0346413765
-
-
Dissertation, Universität Kiel
-
a) S. Retzow, Dissertation, Universität Kiel, 1993;
-
(1993)
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-
Retzow, S.1
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28
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0346413763
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-
Dissertation, Universität Münster
-
b) T. Heinl, Dissertation, Universität Münster, 1998.
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(1998)
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Heinl, T.1
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29
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0000927272
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F. Galinovsky, P. Knoth, W. Fischer, Monatsh. Chem. 1955, 86, 1014-1023.
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Monatsh. Chem.
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-
Galinovsky, F.1
Knoth, P.2
Fischer, W.3
-
30
-
-
0029798146
-
-
Beak and co-workers were able to enhance enantioselectivity with a kinetic resolution by trapping preferentially the more reactive diastereomer of the epimeric lithio N-pivaloyl-o-ethylaniline/(-)-sparteine complexes with 0.45 equiv of trimethylsilyl chloride, while the remaining diastereomer epimerized by warming the reaction mixture to -25°C and by addition of another 0.45 equiv trimethylsilyl chloride; A. Basu, J. Gallagher, P. Beak, J. Org. Chem. 1996, 61, 5718-5719.
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J. Org. Chem.
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, pp. 5718-5719
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Basu, A.1
Gallagher, J.2
Beak, P.3
-
31
-
-
0346413762
-
-
note
-
E′ mechanism as it was found for other allyllithium sparteine complexes.[refs. 4d, 7c, 12] The low enantioenrichment in the products kept us from continuing our efforts in structure elucidation of silanes 7a and 7b.
-
-
-
-
33
-
-
0001563071
-
-
b) A. Deiters, D. Hoppe, Angew. Chem. 1999, 111, 529-532; Angew. Chem. Int. Ed. 1999, 38, 546-548;
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Angew. Chem.
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Deiters, A.1
Hoppe, D.2
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34
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0033558172
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b) A. Deiters, D. Hoppe, Angew. Chem. 1999, 111, 529-532; Angew. Chem. Int. Ed. 1999, 38, 546-548;
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Angew. Chem. Int. Ed.
, vol.38
, pp. 546-548
-
-
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35
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2842586098
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K. Behrens, R. Fröhlich, O. Meyer, D. Hoppe, Eur. J. Org. Chem. 1998, 2397-2403.
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Eur. J. Org. Chem.
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Behrens, K.1
Fröhlich, R.2
Meyer, O.3
Hoppe, D.4
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36
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0005366195
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G. Fraenkel, C. Cottrell, J. Ray, J. Russel, Chem. Commun. 1971, 273-274; G. Fraenkel, B. Appleman, G. Ray, J. Am. Chem. Soc. 1974, 96, 5113.
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Chem. Commun.
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Fraenkel, G.1
Cottrell, C.2
Ray, J.3
Russel, J.4
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37
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0016386668
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G. Fraenkel, C. Cottrell, J. Ray, J. Russel, Chem. Commun. 1971, 273-274; G. Fraenkel, B. Appleman, G. Ray, J. Am. Chem. Soc. 1974, 96, 5113.
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J. Am. Chem. Soc.
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Fraenkel, G.1
Appleman, B.2
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39
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0000551865
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b) G. Fraenkel, S. Subramanian, A. Chow, J. Am. Chem. Soc. 1995, 117, 6300-6307;
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J. Am. Chem. Soc.
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Fraenkel, G.1
Subramanian, S.2
Chow, A.3
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0029798409
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e) B. L. Lucht, M. P. Bernstein, J. F. Remenar, D. B. Collum, J. Am. Chem. Soc. 1996, 118, 10707-10718.
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Lucht, B.L.1
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Remenar, J.F.3
Collum, D.B.4
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44
-
-
0347044036
-
-
note
-
-1 [ref. 17].
-
-
-
-
46
-
-
0347044033
-
-
note
-
Semiempirical calculations (MOPAC, PM3) give 5% longer C-Li and C-N-bonds for (-)-α-isosparteine/mdenide-complexes 6 compared with (-)-sparteine-complexes 5.
-
-
-
-
48
-
-
84988129057
-
-
H, C, N, O: J. J. P. Stewart, J. Comput. Chem. 1989, 10, 209-220; Li: E. Anders, R. Koch, P. Freunscht, J. Comput. Chem. 1993, 14, 1301-1312.
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J. Comput. Chem.
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, pp. 209-220
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Stewart, J.J.P.1
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49
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-
84913536475
-
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H, C, N, O: J. J. P. Stewart, J. Comput. Chem. 1989, 10, 209-220; Li: E. Anders, R. Koch, P. Freunscht, J. Comput. Chem. 1993, 14, 1301-1312.
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J. Comput. Chem.
, vol.14
, pp. 1301-1312
-
-
Anders, E.1
Koch, R.2
Freunscht, P.3
-
50
-
-
0347044034
-
-
note
-
2-symmetry of (-)-sparteine, should be transferable to the transition state of the lithiation.
-
-
-
-
51
-
-
0347674722
-
-
note
-
E′-mechanism, no interaction between the electrophiles methyl iodide and trimethylsilyl chloride should exist and the configuration of the lithium should have no influence on the enantioenrichment in the substitution products. This configuration could have an influence in the reaction with carbonyl compounds, though, were a precoordination between the lithium and the carbonyl oxygen is supposed [ref. 2a].
-
-
-
-
52
-
-
0000688113
-
-
I. Hoppe, M. Marsch, K. Harms, G. Boche, D. Hoppe, Angew. Chem. 1995, 107, 2328-2330; Angew. Chem. Int. Ed. Engl 1995, 34, 2158-2160.
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(1995)
Angew. Chem.
, vol.107
, pp. 2328-2330
-
-
Hoppe, I.1
Marsch, M.2
Harms, K.3
Boche, G.4
Hoppe, D.5
-
53
-
-
33748615119
-
-
I. Hoppe, M. Marsch, K. Harms, G. Boche, D. Hoppe, Angew. Chem. 1995, 107, 2328-2330; Angew. Chem. Int. Ed. Engl 1995, 34, 2158-2160.
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(1995)
Angew. Chem. Int. Ed. Engl
, vol.34
, pp. 2158-2160
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-
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54
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0032785040
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E.-U. Würthwein, K. Behrens, D. Hoppe, Chem. Eur. J. 1999, 5, 3459-3463.
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Chem. Eur. J.
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Würthwein, E.-U.1
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Hoppe, D.3
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55
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0005750823
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H.-J. Hansen, H.-R. Sliwka, W. Hug, Helv. Chim. Acta 1979, 62, 1120-1128.
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Helv. Chim. Acta
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Hansen, H.-J.1
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Hug, W.3
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