When 5, 6-diphenyl-1, 2, 4-triazine-3-thiol was heated in methanol or ethanol under neutral conditions, the addition of methanol or ethanol across the N
4-C
5 bond occurred to give the corresponding 5-alkoxy-4, 5-dihydro-5, 6-diphenyl-1, 2, 4-triazine-3-thiol. Such reaction was not observed in 1-butanol. When the triazine derivative refluxed in 2-propanol, bis(5, 6-diphenyl-1, 2, 4-triazin-3-yl) disulfide was obtained instead of the expected addition compound. Structurally similar compounds, 3-methylthio-5, 6-diphenyl-1, 2, 4-triazine and 6-methyl-5-phenyl-1, 2, 4-triazine-3-thiol did not undergo such reaction. The synthesized compounds were examined mainly for activities against influenza viruses. 3-Mercapto- and 5-alkoxy-4, 5-dihydro-3-mercapto-5, 6-diphenyl-1, 2, 4-triazines exhibited 50% inhibitory concentrations of 12.5-63.1 μg/ml (Index 12.6-63.5) against influenza viruses such as A
0/PR-8, A
1/FM-1, A
1/Fukuoka, A
2/Adachi, A
2/Aichi, B/Lee, B/Kagoshima and Horse/Miami in the chorio-allantoic membrane culture.
抄録全体を表示