Phosphorus oxychloride → 5,7-Dimethyl-2-(3-nitrophenyl)imidazo[5,1-f][1,2,4]triazin-4-(3H)one

Participants

Reaction Conditions

Reaction Steps

A solution of 1.93 g (6.36 mmol) of N-{1-[3-(3-nitrophenyl)-5-oxo-4,5-dihydro-1,2,4-triazin-6-yl]ethyl}acetamide from example 6A in 1,2-dichloroethane is treated with 2.93 g (1.78 ml, 19.09 mmol) of phosphoryl chloride. The mixture is stirred for 3 h at 95° C. After cooling, it is hydrolyzed using a couple of drops of aqueous sodium hydrogencarbonate solution. The solvent is removed in vacuo and the residue is purified by flash chromatography (eluent gradient: dichloromethane/methanol 100:1-50:1-30:1-20:1).

Provenance & Evidence