Potassium Hydroxide → 2-(4-(4-Chlorophenyl)tetrahydro-2H-pyran-4-yl)acetic acid

A stirred solution of (4-{4-chloro-phenyl}-tetrahydro-pyran-4-yl)-cyano-acetic acid ethyl ester (3.3 g, Reference Example 22) in ethylene glycol (50 mL) was treated with a solution of potassium hydroxide (5 g) in water (10 mL) in one portion and then heated at reflux temperature for 23 hours. The resultant pale amber solution was evaporated and the oily residue was treated with water (50 mL). The mixture was washed with diethyl ether (20 mL), then ice-cooled, then acidified to pH 1 by addition of concentrated hydrochloric acid (3 mL) and then extracted with diethyl ether (50 mL). The organic extract was washed with water (25 mL) then dried over magnesium sulfate and then evaporated to give the title compound (3.42 g) as a colourless oil, which slowly crystallised on standing. LC-MS: RT=2.92 minutes, MS(ES+): 253 and 255(M+H)+.

1. temperatureheated
2. temperatureat reflux temperature for 23 hours
3. customThe resultant pale amber solution was evaporated
4. additionthe oily residue was treated with water (50 mL)
5. washThe mixture was washed with diethyl ether (20 mL)
6. temperatureice-cooled
7. additionacidified to pH 1 by addition of concentrated hydrochloric acid (3 mL)
8. extractionextracted with diethyl ether (50 mL)
9. extractionThe organic extract
10. washwas washed with water (25 mL)
11. dry with materialthen dried over magnesium sulfate
12. customevaporated

ORD-Eintrag

ord-aea4233aeeba4efaad5aaf33e9d6b4ed

Quelldatensatz

uspto-grants-2007_01

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US07166616B2