A Highly Enantiocontrolled Strategy for the Synthesis of Benzylic Quaternary Carbon Centers. A Formal Total Synthesis of (-)-Mesembrine
摘要:
A remarkable substituent effect by a trimethylsilyl group was observed on the enantioselectivity of the tandem asymmetric epoxidation and enantiospecific ring expansion of 2-cyclopropylidene-2-(4,5-dimethoxy-2-(trimethylsiyl)phenyl)ethanol (24), affording (S)-(-)-2-(4,5-dimethoxy)-2-(trimethylsilyl)phenyl-2-(hydroxymethyl)cyclobutanone (25) in high enantiomeric excess. This feature enabled us to accomplish a concise and highly enantioselective total synthesis of(-)-mesembrine (1), providing a new and general strategy for the enantioselective synthesis of benzylic quaternary carbon centers.
An asymmetric synthesis of benzylic quaternary carbon centers. A formal total synthesis of (−)-mesembrine
作者:Hideo Nemoto、Tetsuro Tanabe、Keiichiro Fukumoto
DOI:10.1016/s0040-4039(00)78256-6
日期:1994.8
cyclopropylideneethanol 11 as a key step, was converted into the olefinic cyclobutanone 20 which was then transformed into the ketonic lactone 22via the olefinic lactone 21. This constitutes the formal totalsynthesis of (−)-mesembrine (1).
A Highly Enantiocontrolled Strategy for the Synthesis of Benzylic Quaternary Carbon Centers. A Formal Total Synthesis of (-)-Mesembrine
作者:Hideo Nemoto、Tetsuro Tanabe、Keiichiro Fukumoto
DOI:10.1021/jo00126a030
日期:1995.10
A remarkable substituent effect by a trimethylsilyl group was observed on the enantioselectivity of the tandem asymmetric epoxidation and enantiospecific ring expansion of 2-cyclopropylidene-2-(4,5-dimethoxy-2-(trimethylsiyl)phenyl)ethanol (24), affording (S)-(-)-2-(4,5-dimethoxy)-2-(trimethylsilyl)phenyl-2-(hydroxymethyl)cyclobutanone (25) in high enantiomeric excess. This feature enabled us to accomplish a concise and highly enantioselective total synthesis of(-)-mesembrine (1), providing a new and general strategy for the enantioselective synthesis of benzylic quaternary carbon centers.