Pyrimido[4,5-d]pyrimidines, Pyrimido[4',5':4,5]pyrimido[6,1-a]azepines, and an Imidazo[5,1-f][1,2,4]triazine by Three Component Reaction
作者:Heinrich Wamhoff、Andreas Schmidt
DOI:10.3987/com-92-s(t)102
日期:——
Recent examples of the three component reaction: iminophosphoranes/isocyanates/heteroarenes (imines) are described. The uracil (1) affords with O-methyl-epsilon-caprolactim ether and isocyanates the pyrimido[4',5':4,5]pyrimido[6,1-a]azepines (6a-c) and with benzylideneaniline (8) the pyrimido[4,5-d]pyrimidines (9a-d), while azodicarboxylate gives the isofervenuline, pyrimido[4,5-e][1,2,4]triazine (11). Furthermore, pyrimido[4,5-d]-pyrimidine (15) is obtained via 14 from 1, N-phenylbenzimidoyl chloride (13), and phenylisocyanate, while the tautomeric mixture 17A half arrow right over half arrow left 17B results from treatment of 6-aminouracil (16) with 13; interception with dimethyl acetylene-dicarboxylate gives the pyrido[2,3-d]pyrimidine (19).