Synthetic studies on zoapatanol: Construction of oxepanes via an intramolecular 1,3-dipolar cycloaddition strategy
作者:Tony K.M. Shing、Ching-Hung Wong、Ting Yip
DOI:10.1016/0957-4166(96)00149-8
日期:1996.5
The nitrones derived from beta-allyloxyaldehydes with a beta-quaternary centre cyclized to give six- instead of seven-membered O-heterocycles exclusively whereas a nitrile oxide derived from a gamma-allyloxyaldehyde with a gamma-quaternary centre cyclized to yield an oxepane ring as the sole product. Using the latter intramolecular nitrile oxide cycloaddition as the key step, optically active oxepane 5, which is a suitable intermediate for a synthesis of zoapatanol 1, has been constructed from D-glucose. Copyright (C) 1996 Elsevier Science Ltd