Studies on the Synthesis of Furanosteroids. I. Viridin Models
作者:E. Hampton Sessions、Peter A. Jacobi
DOI:10.1021/ol061697h
日期:2006.8.1
Alkyne oxazoles of general structure I are transformed directly to furo[2,3-b]phenol derivatives II by a sequence involving intramolecular Diels-Alder/retro-Diels-Alder reaction followed by tautomerization. Suitably functionalized phenols II undergo an intramolecular phenol-dienone-aldol condensation, generating the A,B,E-ring skeleton III characteristic of the viridin (1) class of furanosteroids.
通过分子内Diels-Alder / retro-Diels-Alder反应,然后进行互变异构化的序列,将具有一般结构I的炔基恶唑直接转化为呋喃[2,3-b]苯酚衍生物II。适当地官能化的酚II经过分子内的酚-二烯酮-醛醇缩合,生成具有viridin(1)类呋喃类固醇特性的A,B,E环骨架III。