Formation of N,N-Di(5-alkoxycarboeyl-5-methyl-2-oxo-1-phenyl-2,5-dihydro-1H-pyrrol-3-yl)-N,N'-diphenyloxalylamicles in the Synthesis of Alkyl 4-Methyl-2,3,6-trioxo-1,5-diphenyl-1,2,3,4,5,6-hexahydropyrrolo[3,4-b]pyrrole-4-carboxylates

摘要

It was established formerly that in the reaction of 5-alkoxycarbonyl-1-aryl-3-arylamino-5-methyl-3-pyrrolin-2-ones with oxalyl chloride alkyl 4-methyl-2,3,6-trioxo-1,5-diphenyl-1,2,3,4,5,6-hexahydropyrrolo[3,4-b] pyrrole-4-carboxylates were obtained [ 1 ].