Highly Efficient and Stereoselective N-Vinylation of Oxiranecarboxamides and Unprecedented 8-<i>endo</i>-Epoxy-arene Cyclization: Expedient and Biomimetic Synthesis of Some <i>Clausena</i> Alkaloids
作者:Luo Yang、Gang Deng、De-Xian Wang、Zhi-Tang Huang、Jie-Ping Zhu、Mei-Xiang Wang
DOI:10.1021/ol070292+
日期:2007.3.1
Catalyzed by CuI/N,N-dimethylglycine, oxiranecarboxamides underwent a highly efficient and stereoselective N-vinylation reaction with (Z)-1-aryl-2-bromoethenes to afford the corresponding enamides. The method has been applied to a straightforward synthesis of (-)-(2R,3S)-SB204900, the enantiomer of the natural product. Following a hypothetic biomimetic pathway, both (+)-(5R,6S)-xi-Clausenamide and (-)-(5R,6S)-balasubramide have been efficiently synthesized for the first time through the unprecedented intramolecular 8-endo-epoxy-arene cyclization of (Z)-N-(phenylvinyl)oxiranecarboxamides.