Role of Sterically Demanding Chiral Dirhodium Catalysts in Site-Selective C–H Functionalization of Activated Primary C–H Bonds
作者:Changming Qin、Huw M. L. Davies
DOI:10.1021/ja504797x
日期:2014.7.9
sterically demanding dirhodium tetracarboxylate catalysts on the site selectivity of C-H functionalization by means of rhodium carbene-induced C-Hinsertion is described. The established dirhodium tetraprolinate-catalyzed reactions of aryldiazoacetates cause preferential C-H functionalization of secondary C-H bonds as a result of competing steric and electronic effects. The sterically more demanding dirhodium
of tertiary and secondary benzylic C(sp3)-H, aliphatic C(sp3)-H, and drug-molecules-based C(sp3)-H bonds containing in substrates are well tolerated under our protocol. The simultaneous gram-scale synthesis and the ease of transformation of azide to amine collec-tively advocate for the potential application in the preparative syn-thesis. Good reactivity of tertiary benzylic C(sp3)-H bond and se-lectivity