 Proposed was a catalytic cycle involving oxidative addition of the aryl bromide.In May 1994, Buchwald published an extension of the Migita paper offering two major improvements over the original paper.First, transamination of Bu3SnNEt2 followed by argon purge to remove the volatile diethylamine allowed extension of the methodology to a variety of secondary amines (both cyclic and acyclic) and primary anilines.