Easy α-alkylation of ketones with alcohols through a hydrogen autotransfer process catalyzed by RuCl2(DMSO)4
作者:Ricardo Martínez、Diego J. Ramón、Miguel Yus
DOI:10.1016/j.tet.2006.07.013
日期:2006.9
indicate that the process goes through the oxidation of the alcohols with ruthenium (after a previous deprotonation) to yield the corresponding aldehyde and a ruthenium hydride intermediate. In turn, the aldehyde suffers a classical aldol reaction with the starting ketone to form the corresponding α,β-unsaturated ketone, which finally is reduced through a Michael-typeaddition by the aforementioned ruthenium
Radical reactions of bicyclo[2.2.1]heptan-3-spiro-2′-oxiranes
作者:W. Russell Bowman、David S. Brown、Catherine A. Burns、Brian A. Marples、Naveed A. Zaidi
DOI:10.1016/s0040-4020(01)89879-3
日期:1992.1
Tributyltinhydridereduction of 2-bromo- and 2-keto-bicyclo[2.2.1]heptan-3-spiro-2′-oxiranes gives ring opening of the oxirane-rings via intermediate 3-(spiro-2′-oxiranyl)bicyclo[2.2.1]heptan-2-yl radicals, whereas reduction of the analogous 2-(thiocarbonyl)imidazolides) [2-(O-CS-Im)] unusually yields the 2-methoxy derivatives and does not proceed by the expected normal fragmentation to yield 3-(