Ammonia → 4-Propan-2-ylpiperazine-1-carbothioamide

To a suspension of 1-isopropylpiperazine (1.5 g, 11.70 mmol) in THF (24 mL) was added 1,1-thiocarbonyldiimidazole (2.398 g, 13.45 mmol). The reaction mixture was stirred at ambient temperature for about 8 h. Upon addition of the 1,1-thiocarbonyldiimidazole, the reaction mixture slightly warmed. A solution of ammonia (7.0 M in MeOH, 20 mL) was added and the reaction mixture was stirred overnight at ambient temperature. Additional ammonia (7.0 M in MeOH, 20 mL) was added and the reaction mixture was stirred overnight at about 40° C. The reaction mixture was cooled to ambient temperature and solvent was removed under reduced pressure. The residue was triturated with Et2O (15 mL) and filtered to give the title compound (2.5 g, 97%) as a yellow solid: LC/MS (Table 1, Method a) Rt=0.74 min; MS m/z: 188.1 (M+H)+.

1. temperaturethe reaction mixture slightly warmed
2. stirringthe reaction mixture was stirred overnight at ambient temperature
3. stirringthe reaction mixture was stirred overnight at about 40° C
4. temperatureThe reaction mixture was cooled to ambient temperature
5. customsolvent was removed under reduced pressure
6. customThe residue was triturated with Et2O (15 mL)
7. filtrationfiltered

ORD record

ord-98b51aab69fb411daf36b73a29010ab5

Source dataset

uspto-grants-2012_05

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08188083B2