Direct Chemoselective Allylation of Inert Amide Carbonyls
作者:Yukiko Oda、Takaaki Sato、Noritaka Chida
DOI:10.1021/ol3000316
日期:2012.2.3
Direct allylation of inert amidecarbonyls utilizing the Schwartz reagent afforded either substitutedtertiary or secondary amines. A preactivation step was successfully avoided, which is generally a requisite to increase the electrophilicity of amides. The reaction exhibited remarkable functional group tolerance and proceeded even in the presence of methyl esters and nitro groups.
A copper-catalyzed ring-opening hydroamination of methylenecyclopropanes with polymethylhydrosiloxane and O-benzoylhydroxylamines has been developed. The cyclopropane C–C bond cleavage occurs selectively at the more congested proximal position, and the corresponding homoallylamines are obtained in good to excellent yields. The umpolung electrophilic amination strategy with the hydroxylamine derivatives