Catalytic asymmetric synthesis of β-hydroxy ketones by palladium-catalyzed asymmetric 1,4-disilylation of α,β-unsaturated ketones
作者:Yonetatsu Matsumoto、Tamio Hayashi、Yoshihiko Ito
DOI:10.1016/s0040-4020(01)80758-4
日期:1994.1
1,4-Disilylation of β,β-unsaturatedketones with 1,1-dichloro-l-phenyl-2,2,2-trimethyldisilane proceeded in the presence of phosphine-palladium catalysts in benzene. High enantio-selectivity (up to 92%) was observed in the disilylation with dichloro[(R)-2,2′-bis(diphenylphosphino)-1,1′-binaphthyl]palladium(II) as a catalyst (0.5 mol %). The disilylation products, 1-(trimethyisilyloxy)-3-(dichlorophenylsilyl)propenes
Palladium-catalyzed 1, 4-disylation of α, β-unsaturated ketones with 1, 1-dichloro-1-phenyl-2,2,2-trimethyldisilane
作者:Tamio Hayashi、Yonetatsu Matsumoto、Yoshihiko Ito
DOI:10.1016/s0040-4039(00)80440-2
日期:1988.1
1,4-Disilylation of α, β-unsaturated ketones proceeded with 1,1-dichloro-1-phenyl-2,2,2-trimethyldisilane in the presence of a phosphine-palladium catalyst in benzene. Treatment of the disilylation products with an excess of methyllithium generated β-silyl lithium enolates, of which hydrolysis and alkylation gave β-(phenyldimethylsilyl) ketones and anti β-silyl α-alkyl ketones, respectively.
Synthesis of Chiral β,β-Disubstituted Ketones via CuH-Catalyzed Coupling of Aryl Alkenes and 3-Aryl-2<i>H</i>-azirines
作者:Fang Xie、Shijie Dong、Yajun Sun、Wenxing Liu、Xiaodan Liu、Lu Liu、Qin Zhao、Jiangli Wang
DOI:10.1021/acs.orglett.2c03311
日期:2022.11.11
A CuH-catalyzed coupling of arylalkenes with 3-aryl-2H-azirines has been developed to synthesize optically active β,β-disubstituted ketones. We propose that this protocol occurs through a sequence in which a chiral alkylcopper complex regioselectively attacks the N–C2 bonds of azirines to generate chiral β-aryl imines, which additionally afford ketones upon hydrolysis. This method provides a novel