Abstract
4-Phosphazenyl-2,3-dihydropyrrol-2-ones and 5-phosphazenyl-2-pyridones are obtained by addition of dimethyl acetylenedicarboxylate to [(N-acyl)phosphazenyl]enamines. In refluxing dichloromethane the reaction affords exclusively 2,3-dihydropyrrol-2-ones, while in toluene at 110 °C a mixture of 2-pyridones and 2,3-dihydropyrrol-2-ones is formed. They are easily separated by fractional recrystallization. The structures of all new compounds have been unequivocally assigned based on two-dimensional 1H,13C correlation and steady-state nuclear Overhauser enhancement experiments. For 2-pyridones the absolute sign of 4JPH has been determined.
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