Process for the preparation of 4-methyl-5-oxo-3-...

Details Process for the preparation of 4-methyl-5-oxo-3-... Process for the preparation of 4-methyl-5-oxo-3-...

C - Chemistry, Metallurgy

07

D

260/248.6

C07D 253/06 (2006.01) C07D 253/075 (2006.01) C07D 403/04 (2006.01) C07D 405/04 (2006.01)

Patent

CA 1214171

A b s t r a c t Process for the preparation of 4-methyl-5-oxo-3-thioxo-tetrahydro-1,2,4-(2H, 4H)-triazines 4-methyl-5-oxo-3-thioxo-tetr2hydro-1,2,4-(2H,4H)- triazines,which are intermediate products for known herb- icides, can be prepared in high yields by a-process in which an acyl cyanide of the general formula R - C0 - CN (II) wherein R represents an optionally substituted aliphatic radical having up to 12 carbon atoms, an optionally substituted cycloalkyl radical having 3 to 10 carbon atoms, an optionally substituted phenyl or napthyl radical or an optionally substituted heterocyclic radical, is reacted with a carboxylic acid anhydride of the general formula R1 -CO-O-CO-R1 (III) in which R1 represents an optionally substituted aliphatic radical having up to 8 carbon atoms or an optionally substituted phenyl radical, in the presence of a strong acid and, if appropriate, in the presence of a solvent, at a temperature between -50 and 150°C, and the reaction mixture thus obtained is then reacted directly with 4-methyl-thiosemicarbazide (CH3-NH-CS-NH-NH2).

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