Synthetic Studies on Furanosteroids. Functionalization of Ring A of the Viridin Core Skeleton
摘要:
The late-stage installation of an important carbonyl group on ring A of the viridin core skeleton is reported, via a two-step process consisting of benzylic bromination and Kornblum oxidation. The synthetic route described also provides access to several other interesting furanosteroid congeners.
The present invention is a method for synthesizing furanosteroids. The method involves intramolecular Diels-Alder/retro-Diels-Alder reaction and tautomerization of a functionalized alkyne oxazole to produce a furo[2,3-b]phenol derivative which is elaborated by intermolecular and intramolecular condensations to generate ring-A of the furanosteroid. Furanosteroids and pharmaceutical compositions containing the same are also provided.
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.