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Paper | Regular issue | Vol 29, No. 5, 1989, pp.925-928
Published online, 1st January, 1970
DOI: 10.3987/COM-89-4901
Synthesis of 3-Carboethixy-4-oxo-4H-pyrimido[1’,2’:1,5][1,2,4]triazolo[3,4-b]benzoxazole and 5H-Pyrido[3",2":5’,6’]pyrimido[1’,2’:1,5][1,2,4]triazolo[3,4-b]benzoxazole-5-one: Novel Heterocycles

Thallapalli Ramalingam,* Madugula Sree Rama Murty, and Pralhad Balvantrao Sattur

*Regional Research Laboratory, Hyderabad 500 007, India


Reaction of 3-amino-1, 2, 4-triazolo[3,4-b]benzoxazole 2 with diethyl ethoxymethylenemalonate and 2-chloropyridine-3-carboxylic acid chloride afforded 3-carboethoxy-4-oxo-4H-pyrido[1’,2’:1,5][1,2,4]triazolo[3,4-b]benzoxazole 4 and 5H-pyrido[3”,2”:5’,6’]pyrimido[1’,2’:1,5][1,2,4]triazolo[3,4-b]benzoxazole-5-one 6 respectively, new ring systems.