Intermolecular Silacarbonyl Ylide Cycloadditions: A Direct Pathway to Oxasilacyclopentenes
作者:Laura E. Bourque、K. A. Woerpel
DOI:10.1021/ol8018538
日期:2008.11.20
Silacarbonylylides, generated by metal-catalyzed silylene transfer to carbonyls, participate in formal intermolecular 1,3-dipolar cycloaddition reactions with carbonyl compounds and alkynes to form dioxasilacyclopentane acetals and oxasilacyclopentenes in an efficient, one-step process.
Formation and Utility of Oxasilacyclopentenes Derived from Functionalized Alkynes
作者:Timothy B. Clark、K. A. Woerpel
DOI:10.1021/ja047498f
日期:2004.8.1
Oxasilacyclopentenes were shown to be synthetically useful masked allylic alcohols constructed in high yields and regioselectivities from terminal and internal alkynes. Several functional groups were shown to be tolerated utilizing silver-catalyzed silacyclopropenation of alkynes. In situ insertion of various carbonyl compounds into silacyclopropenes afforded regioselective formation of oxasilacyclopentenes. Elaboration of the oxasilacyclopentenes displayed the synthetic utility of these substrates. Both diastereoselective hydrogenation and Diels-Alder reactions utilizing the vinylsilane functionality demonstrated the reactivity and synthetic utility of oxasilacyclopentenes.
Formation and Utility of Azasilacyclopentadienes Derived from Silacyclopropenes and Nitriles
作者:Laura L. Anderson、K. A. Woerpel
DOI:10.1021/ol802412b
日期:2009.1.15
silacyclopropenes provide azasilacyclopentadienes, which can be converted to allylic amines after reduction and protodesilylation. The enamine functionality of azasilacyclopentadienes also participates in 1,4-addition reactions and undergoes a hydroboration and oxidation sequence to form an allylic 1,2-amino alcohol.