Pentacyclic Furanosteroids: The Synthesis of Potential Kinase Inhibitors Related to Viridin and Wortmannolone
作者:Yunhui Lang、Fabio E. S. Souza、Xinshe Xu、Nicholas J. Taylor、Abdeljalil Assoud、Russell Rodrigo
DOI:10.1021/jo900922q
日期:2009.8.7
A regiocontrolled intermolecular Diels−Alder reaction of an o-benzoquinone followed by an intramolecular nitrile oxide cyclization is employed to prepare the BCD fragment of viridin. The AE segment is attached to it by means of an intramolecular Diels−Alder reaction of an o-benzoquinone monoketal generated in situ from tricycle 15 and 5-trimethylsilyl-2E,4E-pentadienol 20. The silyl substituent at