• Bulletin of the Korean Chemical Society
• /
• 제33권4호
• /
• pp.1345-1348
• /
• 2012

• Archives of Pharmacal Research
• /
• 제16권4호
• /
• pp.318-321
• /
• 1993

Cyanoaccetic acid hydrazide reacted with some 2-pyrazolin-5-one, isoxazol-5-one and 2-thiazolin-4-one and their ylidene derivatives to yield several new annelated pyran heterocycles. Structures wre established on the basis of elementary analyses and spectral data studies in addition to synthesis via other routes.