Tetrahedron p. 7855 - 7864 (1990)
Update date:2022-08-04
Topics:
Molina
Vilaplana
Perez
The aza Wittig-type reaction of iminophosphoranes 3, 5-[(N-Arylimino)methyl]-6- [(triphenylphosphoranylidene)amino]-1,3-dimethyl uracils, with aromatic isocyanates leads to the functionalized pyrimido[4,5-d]pyrimidines 4. Iminophosphoranes 5, prepared from 3 by selective reduction with sodium borohydride, undergo dihydropyrimido annelation by reaction with isocyanates to give 7-amino-6-aryl-1,3-dimethyl-1,2,3,4,5,6- hexahydropyrimido[4,5-d]pyrimidines 6.
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(1990)