In the meantime, Fu et al. reported a mild copper-catalyzed coupling of aryl boronic acids and aqueous ammonia (Scheme [¹] ). [6] The reaction proceeds at room temperature without ligands, bases, or other additives, and many functional groups are tolerated under mild conditions. However, the cost and availability of the aryl boronic acids, particularly the highly functionalized ones, hampers their applications. Usually aryl halides are preferred ...
[Hutchby, Marc; Houlden, Chris E.; Gair Ford; Tyler, Simon N. G.; Gagne, Michel R.; Lloyd-Jones, Guy C.; Booker-Milburn, Kevin I. Angewandte Chemie - International Edition, 2009 , vol. 48, # 46 p. 8721 - 8724]