作者:Christian Stapper、Siegfried Blechert
DOI:10.1021/jo025666l
日期:2002.9.1
The first enantioselective synthesis of (+)-dihydrocuscohygrine 1 and cuscohygrine 2 is presented. 1 was obtained in nine steps and 30% overall yield with a ruthenium-catalyzed tandem ring rearrangement metathesis key step starting from enantiomerically pure cycloheptene-1,3,5-triol derivative 6. The unknown absolute configuration of natural dihydrocuscohygrine 1 could be determined as (S,S)-(-). Cuscohygrine
介绍了(+)-二氢cuscohygrine 1和cuscohygrine 2的第一个对映选择性合成。1是以9个步骤和30%的总收率获得的,其中钌催化的串联环重排复分解关键步骤从对映体纯的环庚烯-1,3,5-三醇衍生物6开始。天然二氢cuscohygrine 1的未知绝对构型可以确定为(S,S)-(-)。Cuscohygrine 2是通过琼斯氧化1以定量收率获得的,但不幸的是发生了完全差向异构。