An efficient synthesis of 4-ethyl-4-[(3-hydroxycarbonyl)propyl]dihydro-2(3H)-furanone and its use in a formal total synthesis of (±)-quebrachamine
作者:Andrew G.H. Wee、Qing Yu
DOI:10.1016/s0040-4020(98)00825-4
日期:1998.10
directly afford an epimeric mixture of the tetracyclic lactam 17a,b. Lithium aluminum hydride reduction of 17a,b provides the known tetracyclic amino alcohol 18a,b which, overall, constitutes a formal synthesis of (±)-quebrachamine.
重氮乙酸酯5的Rh 2(OAc)4催化的反应提供了容易到达枢轴环状缩醛13的作用,该缩醛13与色胺经Pictet-Spengler型缩合反应以直接提供四环内酰胺的差向异构体混合物17a,b。氢化锂铝的17a,b还原提供了已知的四环氨基醇18a,b,总体上,该化合物构成了(±)-邻苯二甲胺的形式合成。