Synthesis of Diarylmethanes via Metal-Free Reductive Cross- Coupling of Diarylborinic Acids with Tosyl Hydrazones

摘要

This paper describes a practical and efficientnprocedure that takes advantage of diarylborinic acids as a costeffectivenalternative to arylboronic acids for synthesis ofndiarylmethanes through metal-free reductive cross-couplingnwith N-tosylhydrazones of aromatic aldehydes and ketones.nThe procedure tolerates hydroxyl, halide, amine, and allylnfunctionality, complementary to the transition-metal catalyzed cross-coupling techniques.