Asymmetric synthesis of β-substituted δ-ketoesters via michael-additions of samp/ramp-hydrazones to α,β-unsaturated esters, virtually complete 1.6-asymmetric induction
作者:Dieter Enders、Kyriakos Papadopoulos
DOI:10.1016/s0040-4039(01)99823-5
日期:1983.1
Enders, Dieter; Demir, Ayhan S.; Rendenbach, Beatrice E. M., Chemische Berichte, 1987, vol. 120, p. 1731 - 1736
作者:Enders, Dieter、Demir, Ayhan S.、Rendenbach, Beatrice E. M.
alpha-Lithio methoxy allene reacts with SAMP-hydrazones to give alpha-allenyl hydrazines 5 or 3-methoxy-3-pyrrolines 6 depending on the nature of the solvent. Both compounds have been obtained with d.e. greater than or equal to 99%. Hydrogenolysis of the N-N bond of 6 affords the pyrroline 7 in enantiopure form. (C) 1999 Elsevier Science Ltd. All rights reserved.
Enders, Dieter; Scherer, Hermann J.; Raabe, Gerhard, Angewandte Chemie, 1991, vol. 103, # 12, p. 1676 - 1678
作者:Enders, Dieter、Scherer, Hermann J.、Raabe, Gerhard