Stereoselective synthesis of the “cyathin” diterpene skeleton via an intramolecular pyrylium ylide-alkene cyclization
作者:Philip Magnus、Lan Shen
DOI:10.1016/s0040-4020(98)01162-4
日期:1999.3
The pyrylium ylide precursor 18, available in eight steps from diethyl adipate, undergoes acid catalyzed cyclization to give the cyathin derivative 4α and no detectable amount of the incorrect diastereomer 4β.
该吡喃鎓叶立德前体18,在从己二酸二乙酯八个步骤可用,进行酸催化环化,得到cyathin衍生物4 α和不正确的非对映体没有可检测量4 β。