作者:Jeffrey D. Winkler、Esther C. Y. Lee、LaToya I. Nevels
DOI:10.1021/ol050103s
日期:2005.4.14
[GRAPHICS]Pauson-Khand cyclization of dioxanone photoadduct 21 leads to the formation of a single product in good yield. However, retro-aldol fragmentation of the pentacyclic cyclopentenone 22 leads to the formation of 23, with cis C-8/C-10 intrabridgehead stereochemistry, unlike the target compound ingenol 1, which possesses C-8/C-10 trans intrabridgehead stereochemistry.