Highly Enantioselective Mukaiyama Aldol Reactions Catalyzed by a Chiral Oxazaborolidinium Ion: Total Synthesis of (−)-Inthomycin C
作者:Bidyut Kumar Senapati、Lizhu Gao、Sung Il Lee、Geum-Sook Hwang、Do Hyun Ryu
DOI:10.1021/ol102234k
日期:2010.11.19
A cationic oxazaborolidinium-catalyzed asymmetric Mukaiyama aldol reaction of (1-methoxy-2-methyl-propenyloxy)-trimethylsilane with various aldehydes including α,β-disubstituted acroleins has been developed in high yields and enantioselectivities. The synthetic utility of this methodology was demonstrated in the first short synthesis of naturally occurring inthomycin C in high enantiopurity.
Asymmetric Total Synthesis of (−)-(3<i>R</i>)-Inthomycin C
作者:Sandra Balcells、Maxwell B. Haughey、Johannes C. L. Walker、Laia Josa-Culleré、Christopher Towers、Timothy J. Donohoe
DOI:10.1021/acs.orglett.8b01370
日期:2018.6.15
A short (10 step) and efficient (15% overall yield) synthesis of the natural product (−)-(3R)-inthomycin C is reported. The key steps comprise three C–C bond-forming reactions: (i) a vinylogous Mukaiyama aldol, (ii) an olefin cross-metathesis reaction, and (iii) an asymmetric Mukaiyama–Kiyooka aldol. This route is notable for its brevity and has the advantage of lacking stoichiometric tin-promoted