Ynolates react with ketones at room temperature to afford α,β,β-trisubstituted acrylates (tetrasubstituted olefins) with 2:1−8:1 geometrical selectivities. This can be regarded as a new olefination reaction of ketones giving tetrasubstituted olefins in good yield, even in the case of sterically hindered substrates. The reaction mechanism involves cycloaddition of ynolates with a carbonyl group and
A synthesis of multisubstituted vinylsilanes via ynolates: stereoselective formation of β-silyl-β-lactones followed by decarboxylation
作者:Mitsuru Shindo、Kenji Matsumoto、Kozo Shishido
DOI:10.1039/b418310j
日期:——
(Z)-Selective synthesis of multisubstituted vinylsilanes was achieved by stereoselective protonation or alkylation of beta-silyl-beta-lactone enolates, prepared by cycloadditions of acylsilanes with ynolates, followed by decarboxylation.