M. Malesic et al., THE SYNTHESIS AND TRANSFORMATION OF ETHYL -BENZOYL-1-ETHENYL)AMINO-3-DIMETHYLAMINOPROPENOATE - A NEW SYNTHESIS OF 2,3,4-TRISUBSTITUTED PYRROLES, Journal of heterocyclic chemistry, 34(6), 1997, pp. 1757-1762
The synthesis of ethyl -benzoyl-1-ethenyl)amino-3-dimethylaminopropeno
ate (4) from benzoylacetone (1) via 3-dimethylaminomethylenebenzoylace
tone (2) and ethyl N-(2-acetyl-2-benzoy1-1-ethenyl)glycinate (3) and i
ts transformation into 4-benzoyl-2-ethoxycarbonyl-3-methylpyrrole (9)
is described. Cyclization of 4 into 9 represents a new synthesis of po
lysubstituted pyrroles.