An enantioselective approach to (-)-isoavenaciolide was achieved starting from 1-undecyn-3-ol. The synthesis relied upon the preparation of a chiral 4-silyloxy-2-alkenylborane by hydroboration of a protected 2,3-allenol and subsequent stereoselective addition to 2-thiophenecarboxaldehyde.
An enantioselective approach to (-)-isoavenaciolide was achieved starting from 1-undecyn-3-ol. The synthesis relied upon the preparation of a chiral 4-silyloxy-2-alkenylborane by hydroboration of a protected 2,3-allenol and subsequent stereoselective addition to 2-thiophenecarboxaldehyde.
An 1,2-Elimination Approach to the Enantioselective Synthesis of 1,3-Disubstituted Linear Allenes
作者:Yikang Wu、Yan Zhang、Hong-Dong Hao
DOI:10.1055/s-0029-1219542
日期:2010.4
The construction of 1,3-disubstitutedallene skeleton, which is present in many natural allenes, via an i-PrMgBr-mediated elimination of opticallyactive 3-acetoxy-2-iodo-prop-1-ene derviatives is exemplified through the enantioselective total synthesis of two bioactive natural allenes.
A highly enantioselective total synthesis of paecilocin A and 3-butyl-7-hydroxyphthalide is described. The key steps involved in this synthesis are enzymatic kinetic resolution and Alder-Rickert reaction. (C) 2014 Elsevier Ltd. All rights reserved.