Summary.
The regioselective reaction of N1-benzyl-N2-(4-nitrophenyl)ethanediamide with dialkyl acetylenedicarboxylates or alkyl propiolates in the presence of triphenylphosphine leads to dialkyl 4-benzylamino-1-(4-nitrophenyl)-5-oxo-2,5-dihydro-1H-pyrrole-2,3-dicarboxylates or alkyl 4-benzylamino-1-(4-nitrophenyl)-2-oxo-5-pyrrolidinecarboxylates in good yields.
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Yavari, I., Moradi, L., Nasiri, F. et al. Regioselective Reaction of N1-Benzyl-N2-(4-nitrophenyl)ethanediamide and Acetylenic Esters. Monatsh. Chem. 136, 1757–1761 (2005). https://doi.org/10.1007/s00706-005-0367-y
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DOI: https://doi.org/10.1007/s00706-005-0367-y