Lithium Hydroxide → HCID 18413994, compound

{4,5-Dimethoxy-2-[4-(5-trifluoromethylpyridin-2-yl)piperazine-1-sulfonyl]phenyl}acetic acid methyl ester (0.3 g) was taken up in methanol (10 ml), tetrahydrofuran (10 ml) and water (10 ml). Lithium hydroxide (125 mg) was added and the reaction stirred at RT for 16 hrs. The reaction was diluted with water (10 ml), its volume reduced to one third in vacuo, and the reaction extracted with diethyl ether (3×15 ml). The aqueous layer was acidified to pH 4 with 2M hydrochloric acid and extracted with ethyl acetate (4×25 ml). The combined ethyl acetate extracts were washed with water (25 ml) and brine (25 ml) and dried over sodium sulphate. The solvent was removed in vacuo to yield the title compound as a white solid (291 mg, 100%).

1. extractionthe reaction extracted with diethyl ether (3×15 ml)
2. extractionextracted with ethyl acetate (4×25 ml)
3. washThe combined ethyl acetate extracts were washed with water (25 ml) and brine (25 ml)
4. dry with materialdried over sodium sulphate
5. customThe solvent was removed in vacuo

ORD record

ord-438cf89834a5433d984fd49c1ae7848d

Source dataset

uspto-grants-2002_10

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06465468B1