An enantioselective, stereocontrolled total synthesis of eunicenone A (1) is described starting from geranylgeranylacetylene (9) in 14 steps via intermediates 10-20. The most critical construction in the synthesis is the highly effective Diels-Alder combination of the achiral components 2-bromoacrolein and diene 13 in the presence of the chiral Lewis acid catalyst 14 to form 15 (85% yield, 97% ee,
Eunicenones A and B: Diterpenoid cyclohexenones of a rare skeletal class from a new species of the caribbean gorgonian eunicea
作者:Jongheon Shin、William Fenical
DOI:10.1016/0040-4020(93)80014-k
日期:1993.1
Eunicea. The new compounds are diterpenoid cyclohexenones of a new skeletal class related in part to the linear diterpenoid- substituted quinones and hydroquinones isolated from various plants and animals. The structures of 1 and 2 were determined by spectral and chemical methods, and the absolute stereochemistries of these metabolites were determined by CD methods.