Synthetic Method and Biological Activities of <i>cis</i>-Fused α-Methylene γ-Lactones
作者:Yohsuke Higuchi、Fumito Shimoma、Masayoshi Ando
DOI:10.1021/np020586y
日期:2003.6.1
was developed for the synthesis of cis-fused alpha-methylene gamma-lactones via alpha-methyl gamma-lactones. Bromination of alpha-methyl gamma-lactones with LDA/CBr(4) or TMSOTf/PTAB and successive dehydrobromination with DBU or TBAF of the resulting alpha-bromo-alpha-methyl gamma-lactones gave the desired alpha-methylene gamma-lactones in high yield. This method was successfully applied to the synthesis