Ammonia → Methyl 4-(thioureidomethyl)benzoate

Participants

Reaction Steps

Under an argon atmosphere, to a suspension of methyl 4-aminomethylbenzoate hydrochloride (170.0 g, 0.843 mol) in chloroform (850 ml, 5.0 v/w) were successively added 1,1′-thiocarbonyldiimidazole (purity 90%, 166.0 g, 0.843 mol) and triethylamine (123 ml, 0.885 mol). After stirring at room temperature for 3 hr, 28% aqueous ammonia (570 ml, 8.43 mol) and methanol (170 ml, 1.0 v/w) were added and the mixture was stirred overnight. n-Hexane (1700 ml, 10.0 v/w) and water (850 ml, 5.0 v/w) were successively added to the reaction mixture and the mixture was stirred at room temperature for 3 hrs. The precipitated crystals were collected by filtration, washed successively with n-hexane (500 ml) and water (500 ml) and dried in vacuo to give the title compound (172.5 g, yield 91.3%) as a colorless solid.

Provenance & Evidence