Abstract
Heterocyclic ketene aminals 1 or 2 reacted with 4-nitrobenzhydroximic acid chloride (3) to give the 3,5-diaryl-4-(2-imidazolinyl)-isoxazoles 4 or 3,5-diaryl-4-(2-tetrahydropyrimidinyl)-isoxazoles 5. The mechanism of their formation were also discussed.