Neighboring group participation in epoxide ring cleavage in reactions of some 16α,17α-oxidosteroids with lithium hydroperoxide
作者:Jacek W. Morzycki、Agnieszka Gryszkiewicz、Izabella Jastrzębska
DOI:10.1016/s0040-4020(01)00051-5
日期:2001.3
bases unless a 22-carbonyl group was present; in the case of 22-esters or 22-ketones the epoxide rings were cleaved with base and the corresponding allylic alcohols were formed. The epoxide ring cleavage of 16α,17α-oxido-22-ester with lithium hydroperoxide was followed by lactonization of the intermediate 16β,17α-dihydroxy acid. The saponin OSW-1 aglycone was obtained by reaction of the lactone with isoamyllithium