W. Malinka et T. Bodalski, REARRANGEMENT OF SOME N-SUBSTITUTED PYRROLO[3,4-C]-PYRROLES TO CORRESPONDING PYRROLO[3,4-C)PYRIDINES, Polish Journal of Chemistry, 69(1), 1995, pp. 95-102
The rearrangement of several N-substituted ethyl-1,3-dioxo-1,2-dihydro
-pyrrolo[3,4-c]pyrroles 2 into corresponding pyrrolo[3,4-c]pyridines 4
has been reported. A mechanism of rearrangement involves ethanolysis
of the carboxyimide linkage of 2 followed by pyridine ring closure wit
h formation of the dimethyl-4-oxo-4,5-dihydropyrrolo-[3,4-c]pyridines
4.