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
作者:Syun-ichi Kiyooka、Kazi A Shahid
DOI:10.1016/s0040-4039(00)00234-3
日期:2000.4
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.
RYCHNOVSKY, SCOTT D., ACTA PHARM. NORD., 2,(1990) N, C. 155-160
作者:RYCHNOVSKY, SCOTT D.
DOI:——
日期:——
A Divergent Synthesis of Essentially Enantiopure<i>syn</i>- and<i>anti</i>-Propionate Aldol Adducts Based on the Chiral 1,3,2-Oxazaborolidin-5-one-Promoted Asymmetric Aldol Reaction Followed by Diastereoselective Radical Reduction
作者:Syun-ichi Kiyooka、Kazi Abuds Shahid
DOI:10.1246/bcsj.74.1485
日期:2001.8
Essentially, enantiopure syn- and anti-propionate aldoladducts were divergently synthesized using a novel strategy which utilizes both the highly enantioselective 1,3,2-oxazaborolidin-5-one-promoted aldol reaction with a ketene silyl acetal derived from ethyl 2-bromo propionate and a highly diastereoselective radical debromination reaction. These procedures provide yields that increase to a level