Process for the manufacture of bi-2h-pyrroli(di)nediones

Abstract From the Canadian patent

Process for the Manufacture of Bi-2H-Pyrroli(di)nediones Abstract, Novel substituted tetrahydrohexahydro- and octahydro-, 3,4'-bi-2H-pyrrolo-2,2'-diones of the formula (I), in which each of R1 and R2 represents a carboxy-lower alkyl radical, or an unsubstituted carbamoyl-lower alkyl radical or a carbamoyl-lower alkyl radical which is N-mono- or N,N-di-substituted by lower alkyl, hydroxy-lower alkyl lower alkoxy-lower alkyl, amino-lower alkyl N-mono- or, N,N-di-lower alkylamino-lower alkyl or by N,N-C3-C7-, alkyleneamino-lower alkyl which is unsubstituted or substituted (in the alkyleneamino radical) by lower alkoxycarbonyl and by oxo or hydroxy, or N,N-C3-C7-alkenyleneamino-lower alkyl …