Aa. Bahajaj et al., UNEXPECTED FORMATION AND CRYSTAL-STRUCTURE OF A SPIRO[INDENE-1,7'(6'H)-PYRROLO[3,4-B] PYRIDIN]-5'-ONE, Journal of the Chemical Society. Perkin transactions. I, (9), 1994, pp. 1211-1214
Dehydration of -methylbenzyl)-7-phenylpyrrolo[3,4-b]pyridin-5-one 4b o
n treatment with acid is accompanied by rearrangement, first to 7-dihy
dro-7-phenyl-7-[(E)-2-phenylethenyl]-pyrrolo [3,4-6]pyridin-5-one 10 a
nd then to ro[indene-1,7'(6'H)-pyrrolo[3.4-6]pyridin]-5'-ones 9a, b. C
rystal structures of two rearranged products 9a and 10 are reported.