Abstract
The iminophosphorane (3), obtained from reaction of ethyl 3‐amino‐4‐cyano‐1‐phenyl‐1H‐pyrrole‐2‐carboxylate (2) with triphenylphosphine, hexachloroethane, and triethylamine, reacted with aromatic isocyanates to give carbodiimides (4). Further reaction of 4 with various amines, phenols, or ROH to give 2,3,5,7‐tetrasubstituted 3H‐pyrrolo[3,2‐d]pyrimidine‐4(5H)‐ones (6) in satisfactory yields in the presence of catalytic amount of sodium alkoxide or solid potassium carbonate.
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