Thiourea → 2-(5-difluoromethoxy-1-methyl-3-trifluoromethyl-1H-pyrazole-4-ylmethyl)-isothiourea hydrochloride
Reaction equation
[Cl:1][CH2:2][C:3]1[C:4]([C:13]([F:16])([F:15])[F:14])=[N:5][N:6]([CH3:12])[C:7]=1[O:8][CH:9]([F:11])[F:10].[NH2:17][C:18]([NH2:20])=[S:19]>C(O)C>[ClH:1].[F:10][CH:9]([F:11])[O:8][C:7]1[N:6]([CH3:12])[N:5]=[C:4]([C:13]([F:16])([F:15])[F:14])[C:3]=1[CH2:2][S:19][C:18](=[NH:17])[NH2:20]Participants
4
Reactant 2
Product 1
Reagents, catalysts & solvents 1
Procedure
To a solution of 3.7 g (purity: 83.4%, 11.7 mmol) of 4-chloromethyl-5-difluoromethoxy-1-methyl-3-trifluoromethyl-1H-pyrazole in 20 ml of ethanol was added 0.8 g (11.1 mmol) of thiourea, followed by stirring at room temperature overnight and further heating and stirring at 50° C. for 1 hour. The solvent was removed by evaporation under reduced pressure and the residue was washed with n-hexane to obtain 3.8 g (yield: 96.4%) of 2-(5-difluoromethoxy-1-methyl-3-trifluoromethyl-1H-pyrazole-4-ylmethyl)-isothiourea hydrochloride as white crystals (melting point: 117 to 119° C.)