Enantiospecific synthesis of (−)-3-iso-19,20-dehydro-β-yohimbine from secologanin: a route to normal and pseudo stereoisomers of yohimbine
作者:Richard T Brown、Simon B Pratt、Paul Richards
DOI:10.1016/s0040-4039(00)00912-6
日期:2000.7
Hydrolysis of secologanin ethylene acetal at pH 7 resulted in stereoselective aldol cyclisation to a cyclohexene aldehyde, which, on reductive amination and cyclisation with tryptamine afforded (−)-3-iso-19,20-dehydro-β-yohimbine, converted into various normal and pseudo isomers of yohimbine.
在7的条件下水解secologanin乙缩醛导致立体选择性的羟醛环化成环己烯醛,然后用色胺将其还原胺化和环化,得到(-)-3-iso-19,20-dehydro-β-育亨宾,转化为各种正常和育亨宾的假异构体。