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Report | Regular issue | Vol 22, No. 5, 1984, pp.1095-1099
Published online, 1st January, 1970
DOI: 10.3987/R-1984-05-1095
■ Reaction of Diketone with 3-Amino-5,6-disubstituted-1,2,4-triazine Derivatives

Mohsen Daneshtalab* and Mohammad Hassan Hooshdar Tehrani

*Department of Chemistry, College of Pharmacy, Tehran University, Tehran 14, Iran

Abstract

Reaction of diketene with 3-amino-5,6-dimethyl-1,2,4-triazine ( Ia ) in acetic acid or benzene medium afforded 3-acetonyl-2,3,6-trimethyl-3H-pyrimido[1,2-b]-1,2,4-triazin-8(5H)-one ( II ) . On the other hand, reaction of diketene with 3-amino-5,6-diphenyl-1,2,4-triazine ( Ib) gave rise to 3-acetoacetylamino- 5,6-diphenyl-l,2,4-triazine ( V ) and 3-(3-acetyl-4-hydroxy-6-methylpyridin-2- one-1-yl) -5,6-diphenyl-1,2 ,4-triazine ( VI ) , respectively. The reaction mechanism is discussed.