Ammonium Hydroxide → 4-Trifluoromethyl-thiazole-2-carboxylic acid amide

To a solution of 4-trifluoromethyl-thiazole-2-carboxylic acid (50 g, 1 eq.) in anhydrous THF (480 mL) was added carbodiimidazole (45.2 g, 1.1 eq.) portionwise under nitrogen in an ice/water bath (about 5° C.). The reaction mixture was stirred at room temperature for 16 hrs. NH4OH (25% in H2O; 1.930 mL) was added. The solution was stirred for 4 hrs, and then partitioned in DCM (500 mL) and H2O (500 mL). Aqueous layer was further extracted with DCM (500 mL). The combined organic layers were dried over MgSO4, filtered, and concentrated in vacuo to yield compound 285a as an orange solid in 72% yield. MS (ESI, EI+) m/z=197 (MH+).

1. stirringThe solution was stirred for 4 hrs
2. custompartitioned in DCM (500 mL)
3. extractionAqueous layer was further extracted with DCM (500 mL)
4. dry with materialThe combined organic layers were dried over MgSO4
5. filtrationfiltered
6. concentrationconcentrated in vacuo

ORD record

ord-8b5ca17d601a468db167d38fc622bcdf

Source dataset

uspto-grants-2013_02

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08377962B2