Enantioselective Addition of Allyltrichlorosilane to Bulky-substituted Aldehydes Catalyzed by Axial N,N′-Dioxide Pivalate
Jie Wang , Shijie Wu , Xiaoke Wang , Longfei Li , Kan Yang , Huajie Zhu , Wan Li , Li Liu
Chemical Research in Chinese Universities ›› 2019, Vol. 35 ›› Issue (4) : 604 -608.
Enantioselective Addition of Allyltrichlorosilane to Bulky-substituted Aldehydes Catalyzed by Axial N,N′-Dioxide Pivalate
Allylation of bulky-substituted aromatic aldehydes with allyltrichlorosilanes were catalyzed by axial biscarboline N,N’-dioxide esters with high enantioselectivities up to 92% e.e. for 1-(4-chlorophenyl)-9-methyl-9H-pyrido[3,4-b]indole-3-carbaldehyde and 90% e.e. for 1-(3-methoxyphenyl)-9-methyl-9H-pyrido[3,4-b]indole-3-carbaldehyde, respectively. Total 22 aldehydes were tested with good yields and enantioselectivities. Catalyst 4f exhibited good catalytic enantioselectivity.
Enantioselective allylation / Biscarboline N,N′-dioxide pivalate / Driving-force / Catalytic space
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