Cooperative Palladium/Proline-Catalyzed Direct α-Allylic Alkylation of Ketones with Alkynes
作者:Chi Yang、Kaifan Zhang、Zijun Wu、Hequan Yao、Aijun Lin
DOI:10.1021/acs.orglett.6b02649
日期:2016.10.21
The cooperative palladium/l-proline-catalyzed direct α-allylic alkylation of ketones with alkynes is achieved. This reaction exhibits high atom economy since a leaving group is not liberated and a stoichiometric amount of extra oxidant is not needed. A broad range of functional groups are tolerated, and the reaction scope could be further expanded to aldehydes.
Stereoselective reactions. 30. Enantioselective alkylation of the lithium enolates of six-membered cyclic ketones using tetradentate chiral amines in the presence of lithium bromide
作者:Masatoshi Murakata、Tatsuro Yasukata、Takumi Aoki、Makoto Nakajima、Kenji Koga
DOI:10.1016/s0040-4020(98)00009-x
日期:1998.3
An efficient enantioselectivealkylation of the lithium enolates of cyclohexanone and I-tetralone with reactive alkyl halides was realized using a stoichiometric amount of a tetradentate chiral amine as a ligand for the lithium in the presence of lithiumbromide in toluene.
Enantioselective alkylation at the α-position of cyclic ketones using a chiral lithium amide as a base in the presence of lithium bromide
作者:Masatoshi Murakata、Makoto Nakajima、Kenji Koga
DOI:10.1039/c39900001657
日期:——
An efficient enantioselectivealkylation reaction at the α-position of cyclicketones (1, 2) can be realized in up to 92% enantiometric excess (e.e.) by first forming their lithium enolates using a chirallithiumamide 4 in the presence of lithiumbromide, followed by treatment with alkyl halides.