Chloride → 3-(Dimethylamino)pyrrolidine-1-carbothioamide

To a suspension of potassium thiocyanate (2.02 g, 20.8 mmol) in acetone (10.7 mL) at 0° C. was slowly added pivolyl chloride (2.6 mL, 21.1 mmol). The mixture was stirred at 0° C. for 3 h. Dimethylpyrrolidin-3-yl-amine (2.44 g, 21.3 mmol) was added slowly at 0° C., and the reaction was allowed to warm to room temperature. After stirring at room temperature overnight, the reaction was concentrated, and concentrated hydrochloric acid (10 mL) was added. The reaction was heated to 95° C. with stirring for 1 h. The mixture was allowed to cool to room temperature, and was extracted with dichloromethane. The aqueous layer was made basic with 20% aqueous sodium hydroxide. The basic solution was extracted with dichloromethane. The organics were combined, washed with brine, dried with anhydrous sodium sulfate, filtered, and concentrated. The mixture was diluted with diethyl ether and filtered to provide pure 3-dimethylamino-pyrrolidine-1-carbothioic acid amide (135) (0.863 g, 23.3%) as a white solid.

1. temperatureto warm to room temperature
2. stirringAfter stirring at room temperature overnight
3. concentrationthe reaction was concentrated
4. additionconcentrated hydrochloric acid (10 mL) was added
5. temperatureThe reaction was heated to 95° C.
6. stirringwith stirring for 1 h
7. temperatureto cool to room temperature
8. extractionwas extracted with dichloromethane
9. extractionThe basic solution was extracted with dichloromethane
10. washwashed with brine
11. dry with materialdried with anhydrous sodium sulfate
12. filtrationfiltered
13. concentrationconcentrated
14. additionThe mixture was diluted with diethyl ether
15. filtrationfiltered

ORD-Eintrag

ord-55c08c4e2abf434b924357fc47dc6c8d

Quelldatensatz

uspto-grants-2004_03

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US06699866B2