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Asymmetric N-H Insertion of secondary and primary anilines under the catalysis of palladium and chiral guanidine derivatives
Efficient enantioselective N-H insertion reactions of secondary and primary anilines were catalyzed by palladium(0) in combination with chiral guanidine derivatives. A broad range of substituted anilines were tolerated, and the corresponding products were obtained in high yield (up to 99 %) with good enantioselectivity (up to 94 % ee) under mild reaction conditions. The N-H insertion mechanism was examined by the study of kinetic isotope effects, control experiments, HRMS, and spectroscopic analysis. Hidden talents: Chiral guanidine derivatives were developed as useful ligands for the enantioselective insertion of carbenoids into the N-H bonds of secondary and primary anilines in combination with palladium(0), which was not previously known to promote asymmetric N-H insertion (see scheme; dba=dibenzylideneacetone). The N-H insertion mechanism was examined by kinetic isotope studies, control experiments, HRMS, and spectroscopic analysis. Copyright
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Reference：
Chapter 1 An introduction to palladium catalysis,
Palladium/carbon catalyst regeneration and mechanical application method