Rhodium-catalyzed asymmetric hydroboration of γ,δ-unsaturated amide derivatives: δ-borylated amides
作者:G. L. Hoang、S. Zhang、J. M. Takacs
DOI:10.1039/c8cc01563e
日期:——
γ,δ-Unsaturated amides in which the alkene moiety bears an aryl or heteroaryl substituent undergo regioselective rhodium-catalyzed δ-borylation by pinacolborane to afford chiral secondary benzylic boronic esters. The results contrast the γ-borylation of γ,δ-unsaturated amides in which the disubstituted alkene moiety bears only alkyl substituents; the reversal in regiochemistry is coupled with a reversal
γ,δ-不饱和酰胺(其中烯基部分带有芳基或杂芳基取代基)通过频哪醇硼烷进行区域选择性铑催化的δ-硼化,从而获得手性仲苄基硼酸酯。结果对比了γ,δ-不饱和酰胺的γ-硼化,其中双取代的烯烃部分仅带有烷基取代基。区域化学的逆转与π-面部选择性意义上的逆转相结合。