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
Barbero, Asuncion; Pulido, Francisco J., Synthesis, 2004, # 5, p. 779 - 785
作者:Barbero, Asuncion、Pulido, Francisco J.
DOI:——
日期:——
Intramolecular Ene Reaction of Epoxyallylsilanes: Synthesis of Allyl- and Vinylsilane-Functionalized Cyclohexanols
作者:Asunción Barbero、Pilar Castreño、Gloria Fernández、Francisco J. Pulido
DOI:10.1021/jo051868g
日期:2005.12.1
Lewis acids. Two pathways for the carbonylenereaction are observed: one leading to allylsilane−cyclohexanols when the epoxyallylsilane (28−31) is nonsubstituted, 2-, or 4-monosubstituted and other leading to vinylsilane−cyclohexanols when the epoxyallylsilane (24−27) is 2,4-disubstituted or trisubstituted. An explanation for the observed regio- and stereoselectivity is advanced and a reliable mechanism