Intramolecular Cyclization of <i>tert</i>-Butyldiphenylallylsilane Units and Carbonyl Groups: Allylsilane Terminated Cyclization versus the Ene Reaction
作者:Asunción Barbero、Pilar Castreño、Carlos García、Francisco J. Pulido
DOI:10.1021/jo0158736
日期:2001.11.1
oxoallylsilanes bearing the bulky tert-butyldiphenylsilyl group undergo highly selective intramolecular cyclizations when treated with Lewis acid affording unsaturated cyclopentanols. Two reactivity patterns are observed: allylsilane terminated cyclization involving elimination of silicon or an ene reaction without losing the silyl group. The pathway depends on the ability of a hydrogen beta to the carbonyl