Enantioselective Construction of α‐Chiral Silanes by Nickel‐Catalyzed C(sp3)−C(sp3) Cross‐Coupling

H Yi, W Mao, M Oestreich - Angewandte Chemie International …, 2019 - Wiley Online Library
Angewandte Chemie International Edition, 2019Wiley Online Library
Abstract An enantioselective C (sp3)− C (sp3) cross‐coupling of racemic α‐silylated alkyl
iodides and alkylzinc reagents is reported. The reaction is catalyzed by NiCl2/(S, S)‐Bn‐
Pybox and yields α‐chiral silanes with high enantiocontrol. The catalyst system does not
promote the cross‐coupling of the corresponding carbon analogue, corroborating the
stabilizing effect of the silyl group on the alkyl radical intermediate (α‐silicon effect). Both
coupling partners can be, but do not need to be, functionalized, and hence, even α‐chiral …
Abstract
An enantioselective C(sp3)−C(sp3) cross‐coupling of racemic α‐silylated alkyl iodides and alkylzinc reagents is reported. The reaction is catalyzed by NiCl2/(S,S)‐Bn‐Pybox and yields α‐chiral silanes with high enantiocontrol. The catalyst system does not promote the cross‐coupling of the corresponding carbon analogue, corroborating the stabilizing effect of the silyl group on the alkyl radical intermediate (α‐silicon effect). Both coupling partners can be, but do not need to be, functionalized, and hence, even α‐chiral silanes with no functional group in direct proximity of the asymmetrically substituted carbon atom become accessible. This distinguishes the new method from established approaches for the synthesis of α‐chiral silanes.
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