An efficient construction of bridged chiral tetracyclic indolidines, a core structure of asperparaline, via stereocontrolled catalytic Pauson–Khand reaction
作者:Shinji Tanimori、Tatsuya Sunami、Kouji Fukubayashi、Mitsunori Kirihata
DOI:10.1016/j.tet.2004.12.057
日期:2005.2
A reaction of chiral enyne 22 derived from l-proline with a catalytic amount of cobalt (0) octacarbonyl in the presence of N-methylmorphorine N-oxide gave tricyclic enone 24 in 54% yield (73% based on consumed starting material). Treatment of enone 11 with aqueous methylamine followed by silica gel afforded bridged tetracyclic indolidine 1, a common structural motif of natural metabolites, an asperparaline
在N-甲基吗啡啉N-氧化物存在下,衍生自1-脯氨酸的手性烯炔22与催化量的钴(0)八羰基化合物的反应以54%的收率得到三环烯酮24(基于消耗的原料为73%)。用甲基胺水溶液和硅胶处理烯酮11,得到桥连的四环吲哚啶1,它是天然代谢产物的常见结构基序,天冬酰胺系列化合物以及潜在的中间体,用于合成麻痹性生物碱天冬酰胺C(4)。 70%的产率。