Total Synthesis of (+)-Blastmycinone, (−)-Litsenolide C<sub>1</sub>, and Related Natural Trisubstituted Lactones via Alkynyltungsten Compounds
作者:Ming-Jung Chen、Ching-Yu Lo、Chih-Chien Chin、Rai-Shung Liu
DOI:10.1021/jo0002487
日期:2000.10.1
A general method for totalsynthesis of natural trisubstituted gamma-lactones is developed on the basis of the chemistry of alkynyltungsten compounds. The key step in this approach involves the cycloalkenation of tungsten-eta1-(3R,4S)-pent-1-yne-3,4-diol with aldehydes to give tungsten-oxacarbenium salts, further leading to 3-alkylidene-4-hydroxy-5-methyl-gamma-lactones upon demetalation. This synthetic