An efficient method for the synthesis of enantiopure 2,3-anti-propionate aldols involving a 3,5-syn- or anti-diol subunit through chiral borane-mediated enantioselective aldol reaction coupled with radical reduction
摘要:
2,3-anti-Propionate aldols involving a 3,5-syn- or anti-diol subunit, versatile enantiopure segments available for macrolide synthesis, were prepared by a chiral oxazaborolidinone-promoted asymmetric aldol reaction with 2-bromo-1-ethoxy-2-methyl-1-trimethylsiloxyethene and the following highly anti-preferential radical debromination. (C) 2000 Elsevier Science Ltd. All rights reserved.
A chiral oxazaborolidinone-promoted aldol reaction with a silyl ketene acetal from ethyl 1,3-dithiolane-2-carboxylate. Synthesis of acetate aldols in high enantiomeric purity
作者:Syun-ichi Kiyooka、Mostofa Abu Hena
DOI:10.1016/0957-4166(96)00265-0
日期:1996.8
Asymmetric synthesis of dithiolane aldols 3 was achieved in good yields by using silyl ketene acetal 1, derived from ethyl 1,3-dithiolane-2-carboxylate, in the chiral oxazaborolidinone (L-1 and D-2)-promoted aldol reaction and desulfurization of 3 resulted in production of acetate aldols 4 in high enantiomerc purity.