Alkene Substituents for Selective Activation of <i>endo</i>-Regioselective Polyepoxide Oxacyclizations
作者:Fernando Bravo、Frank E. McDonald、Wade A. Neiwert、Kenneth I. Hardcastle
DOI:10.1021/ol048212e
日期:2004.11.1
The presence of an alkenyl substituent on the terminal epoxide of a polyepoxide substrate enhances the yield of all-endo-regioselective tandem oxacyclization to trans-syn-trans-fused polycyclic ethers. For a substrate in which the epoxide and alkene functional groups are separated by two methylene substituents, a novel bromonium ion-induced endo-regioselective cyclization to bromooxepane is also described