Cyano derivatives containing active methine hydrogen readily underwent 1,4-conjugate addition to conjugated azoalkenes, to give initially hydrazones which cyclised to 1-amino-3-cyano-2,3-dihydropyrrol-2-ols and 1-amino-3-cyano-1H-pyrrole-2(3H)-ones. Both processes took place in high yield and under mild reaction conditions.
O. A. Attanasi, L. De Crescentini, A. McKillop, S. Santeusanio and F. Serra-Zanetti, J. Chem. Soc., Perkin Trans. 1, 1992, 3099 DOI: 10.1039/P19920003099
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