1,2,4-Triazines. II. A new general synthesis of 3,4-dihydro-1,2,4-triazin-5-(2H)ones

3,4-Dihydro-1,2,4-triazin-5-(2H)ones were prepared by the reduction of 3-methylthio-1,2,4-triazin-5-(2H)-ones with sodium borohydride in dimethylformamide. The synthesis appears to be general.