Palladium(II)-Catalyzed Enantioselective C(sp<sup>3</sup>)–H Activation Using a Chiral Hydroxamic Acid Ligand
作者:Kai-Jiong Xiao、David W. Lin、Motofumi Miura、Ru-Yi Zhu、Wei Gong、Masayuki Wasa、Jin-Quan Yu
DOI:10.1021/ja504196j
日期:2014.6.4
An enantioselective method for Pd(II)-catalyzed cross-coupling of methylene β-C(sp3)–H bonds in cyclobutanecarboxylic acid derivatives with arylboron reagents is described. High yields and enantioselectivities were achieved through the development of chiral mono-N-protected α-amino-O-methylhydroxamic acid (MPAHA) ligands, which form a chiral complex with the Pd(II) center. This reaction provides an
despite the recent advances in the fields of both C–H and C–C bond activation. Herein, we report a palladium-catalyzed migrative carbofluorination of saturated amides enabled by the activation of both the C(sp3)–H and the Cquaternary–Cσ bonds. In this transformation, the α-quaternary carbon of Weinreb amides is converted to α-tertiary fluoride with concurrent migration of an aryl or an amido group from