[Cl:1][C:2]1[CH:17]=[CH:16][C:5]([C:6]([NH:8][C:9]2[CH:14]=[CH:13][C:12]([CH3:15])=[CH:11][CH:10]=2)=O)=[CH:4][C:3]=1[C:18]([F:21])([F:20])[F:19].COC1C=CC(P2(SP(C3C=CC(OC)=CC=3)(=S)S2)=[S:31])=CC=1.C1(C)C=CC=CC=1>CCOCC>[Cl:1][C:2]1[CH:17]=[CH:16][C:5]([C:6]([NH:8][C:9]2[CH:14]=[CH:13][C:12]([CH3:15])=[CH:11][CH:10]=2)=[S:31])=[CH:4][C:3]=1[C:18]([F:21])([F:20])[F:19]4-chloro-N-p-tolyl-3-trifluoromethyl-benzamide (1.0 g, 3.19 mmol), Lawesson's reagent (774 mg, 0.6 eq.) and toluene (2.5 mL) is mixed in a microwave vial. The mixture is heated to 120° C. for 1000 seconds using microwave irradiation. The mixture turned into clear solution. Ether (50 ml) is added to dilute the reaction mixture. The solution is then washed with brine, dried over MgSO4, filtered and concentrated. The mixture is purified by column chromatography (EtOAc/Hexanes=5/95) to afford 970 mg (92%) of 4-chloro-N-p-tolyl-3-trifluoromethyl-thiobenzamide as a yellow solid.
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