Five-membered 2,3-dioxo heterocycles:: LIV.: Double spiro heterocyclization of methyl 1-aryl-3-benzoyl-4,5-dioxo-4,5-dihydro-1H-pyrrole-2-carboxylates with 3-arylamino-5,5-dimethylcyclohex-2-en-1-ones

Methyl 1-aryl-3-benzoyl-4,5-dioxo-4,5-dihydro-1H-pyrrole-2-carboxylatcs reacted with 3-arylamino-5,5-dimethylcyclohex-2-en- 1-ones in boiling benzene to give the corresponding 1,1'-diaryl-3'-benzoyl-4'-hydroxy- 6,6-dimethyl-1,1',2,4,5,5',6,7-octahydrospiro[indole-3,2'-pyrrole]-2,4,5'-triones and 1'-aryl-4-arylamino-3-benzoyl-6',6'-dimethyl-1',2',4',5',6',7'-hexahydro-5H-spiro[furan-2,3'-indole]-2',4',5-triones whose structure was proved by X-ray analysis.