Construction of 1-Heteroaryl-3-azabicyclo[3.1.0]hexanes by sp3-sp2 Suzuki-Miyaura and Chan-Evans-Lam Coupling Reactions of Tertiary Trifluoroborates.

Compounds that contain the 1-heteroaryl-3-azabicyclo[3.1.0]hexane architecture are of particular interest to the pharmaceutical industry yet remain a challenge to synthesize. We report herein an expedient and modular approach to the synthesis of 1-heteroaryl-3-azabicyclo[3.1.0]hexanes by Suzuki-Miyaura and Chan-Evans-Lam coupling reactions of tertiary trifluoroborate salts. Our Suzuki-Miyaura cross-coupling protocol is compatible with a broad range of aryl and heteroaryl bromides and chlorides. The unprecedented Chan-Evans-Lam coupling of tertiary trifluoroborates allows the facile construction of 1-heteroaryl-3-azabicyclo[3.1.0]hexanes containing C-tertiary arylamines at the ring juncture.