SYNTHESIS OF 6-CYANOPURINES AND THE ISOLATION AND X-RAY STRUCTURE OF NOVEL 2H-PYRROLES

ino-1,2-dicyanovinyl)-N-2-substituted-formamidines react with dimethyl formamide diethyl acetal at room temperature to give 6-cyanopurines as the major product together with novel [(N,N-dimethylamino)methylidene amino]-2H-pyrroles, which have been fully characterised and a single c rystal X-ray analysis has been carried out on the N-phenyl derivative.