Zhijun Wang, R. Neidlein*
Aug 13, 1998
Citations
0
Influential Citations
3
Citations
Journal
Tetrahedron
Abstract
Abstract 4-Amino-5-chloro-2,7-bis(dimethylamino)pyrimido[4,5-d]pyrimidine (5) was prepared starting from 1,1-diamino-2,2-dicyanoethylene (1) and dichloromethylenedimethy limmonium chloride (2). After reacting with α-aminoacidic esters, 5 was converted into a series of new pyrimido[4,5-d]pyrimidines (7), which underwent cyclization to yield substituted 9,10-dihydro-1,3,4,6,7,10-hexaazacyclohepta[de]naphthalen-8(7H)-one (8).