5,7-dihydro-5,5,7,7-tetramethyl-3-(3-nitrophenyl)furo[3,4-e]-1,2,4-triazine synthesis

Yield:-

Reaction Conditions:

in ethanol;

Steps:

1 5,7-Dihydro-5,5,7,7-tetramethyl-3-(m-nitrophenyl)furo[3,4-e]-as-triazine

EXAMPLE 1 5,7-Dihydro-5,5,7,7-tetramethyl-3-(m-nitrophenyl)furo[3,4-e]-as-triazine A mixture of 1.56 g. (0.01 mole) of 2,2,5,5-tetramethyl-3,4(2H,5H) furandione and 1.80 g. (0.01 mole) 3-nitro benzimidic acid hydrazide in 100 ml. absolute ethanol is refluxed under nitrogen for 18 hours at a bath temperature of 100°C. The excess water is removed from the condensate by using a Dean Stark trap filled with 3A molecular sieves. The resulting mixture is evaporated to dryness in vacuo at 40°C., and the resulting residue is recrystallized from hexane to give 5,7-dihydro-5,5,7,7-tetramethyl-3-(m-nitrophenyl)furo[3,4-e]-as-triazine. Following the above procedure and using in place of 3-nitro benzimidic acid hydrazide, an equivalent amount of

References:

US3962240,1976,A