Five-membered 2,3-dioxo heterocycles: LXXXV. Synthesis of methyl 1-aryl-4,5-dioxo-3-(1-oxo-3-phenylprop-2-en-1-yl)-4,5-dihydro-1H-pyrrole-2-carboxylates and their reaction with 3-amino-5,5-dimethylcyclohex-2-en-1-ones. Molecular and crystalline structure of 4′-hydroxy-1′-(4-methoxyphenyl)-6,6-dimethyl-3′-(1-oxo-3-phenylprop-2-en-1-yl)-1-phenyl-6,7-dihydrospiro[indole-3,2′-pyrrole]-2,4,5′(1H,1′H,5H)-trione

Treatment of methyl 2-arylamino-4-oxo-6-phenylhexa-2,5-dienoates with oxalyl chloride gave methyl 1-aryl-4,5-dioxo-3-(1-oxo-3-phenylprop-2-en-1-yl)-4,5-dihydro-1 H -pyrrole-2-carboxylates which reacted with 3-benzylamino- and 3-arylamino-5,5-dimethylcyclohex-2-en-1-ones to produce 1′-aryl-1-benzyl- and 1,1′-diaryl-4′-hydroxy-6,6-dimethyl-3′-(1-oxo-3-phenylprop-2-en-1-yl)-6,7-dihydrospiro[indole-3,2′-pyrrole]-2,4,5′(1 H ,1′ H ,5 H )-triones.