Biomimetic Synthesis of <i>trans,syn,trans</i>-Fused Polyoxepanes: Remarkable Substituent Effects on the <i>e</i><i>ndo</i>-Regioselective Oxacyclization of Polyepoxides
作者:Jason C. Valentine、Frank E. McDonald、Wade A. Neiwert、Kenneth I. Hardcastle
DOI:10.1021/ja050013i
日期:2005.4.1
and C15 in 1) when the tandem cyclization cascade is terminated by a carbonyl oxygen nucleophile. In contrast to expectations from earlier reports with simpler epoxide substrates, alkyl substituents are not required at internal epoxide positions corresponding to C7 and C11 in polyepoxide 1. Furthermore, we report that trimethylsilyl serves as a removable regioselectivity-directing substituent at positions