Multicomponent reactions of primary 1,2- and 1,3-diamines with carbonyl compounds and isocyanides resulting in the formation of diverse 2-amino-1,4-diazaheterocycles are described. Lewis acids (LAs) promote the reactions effectively, and chlorotrimethylsilane (TMSCl) has been found to be a promoter of choice. The scope and limitations of the reactions with regard to each of the components are evaluated