[NH2:1][C:2]1[S:3][C:4]2[CH:10]=[C:9]([O:11][C:12]([F:15])([F:14])[F:13])[CH:8]=[CH:7][C:5]=2[N:6]=1.O.[NH2:17]N.Cl.Cl.NN>C(O)CO>[NH:1]([C:2]1[S:3][C:4]2[CH:10]=[C:9]([O:11][C:12]([F:15])([F:13])[F:14])[CH:8]=[CH:7][C:5]=2[N:6]=1)[NH2:17]To a suspension of 93.6 g of 2-amino-6-trifluoromethoxybenzothiazole in 420 cm3 of ethylene glycol under a stream of nitrogen are added 48 g of hydrazine hydrate and 42 g of hydrazine dihydrochloride. The mixture is heated for 2 hours at 140° C. After cooling, the precipitate is filtered off and triturated with a water/diethyl ether mixture (1/1 by volume). 89.9 g of 2-hydrazino-6-trifluoromethoxybenzothiazole are thus obtained, melting at 208° C.
Loading…
