An enantioselective palladium-catalyzed C(sp(2))-H carbamoylation for the preparation of chiral iso-indolines was described for the first time. With chiral monophosphorus ligand (R)-AntPhos as the ligand, a series of chiral isoindolines were prepared from diarylmethyl carbamoyl chlorides in excellent yields and enantioselectivities with the palladium loading as low as 1 mol%. Initial mechanistic studies indicated the asymmetric cyclization catalyzed a palladium species with a single chiral monophosphorus ligand. (C) 2019 Elsevier Ltd. All rights reserved.
Radical Amination with Trimethylstannylated Benzophenone Imine
摘要:
Intermolecular radical amination reactions of various primary, secondary, and tertiary alkyl radicals by using trimethylstannylated benzophenone imine A as a novel radical acceptor to provide imines of type B are described. These Imines are readily reduced with NaBH4 to the corresponding secondary amines C. The novel radical amination can be combined with typical radical cyclization reactions.