Reaktion #72222

Reaktionsgleichung

Water

lithium hydroxide

Methyl cis(±)-5-(4-{[(4-chloro-5-ethyl-1H-imidazol-2-yl)carbonyl]amino}-3-methoxypiperidin-1-yl)-3-methylthiophene-2-carboxylate

THF

→

title compound

Ausbeute 37.0%

cis(±)-5-(4-{[(4-Chloro-5-ethyl-1H-imidazol-2-yl)carbonyl]amino}-3-methoxypiperidin-1-yl)-3-methylthiophene-2-carboxylic acid

Ausbeute 37.0%

Lösungsmittel

methanol

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.STIRRINGthe mixture was stirred for 19 hours
2. 2
   workup.STIRRINGfurther stirred at 40° C. for 6.5 hours and at 70° C. for two hours
3. 3
   Waschenthe mixture was washed with ethyl acetate
4. 4
   workup.ADDITIONA 1 N aqueous hydrochloric acid solution (2.5 mL) was added to the aqueous layer
5. 5
   Extraktionfollowed by extraction with ethyl acetate
6. 6
   TrocknenThe combined organic layers were dried over anhydrous magnesium sulfate
7. 7
   Filtrationfiltered
8. 8
   Einengenthe filtrate was concentrated under reduced pressure
9. 9
   Waschenwashed in diethyl ether

Vorschrift

Methyl cis(±)-5-(4-{[(4-chloro-5-ethyl-1H-imidazol-2-yl)carbonyl]amino}-3-methoxypiperidin-1-yl)-3-methylthiophene-2-carboxylate obtained in Example (245d) (65 mg, 0.15 mmol) was dissolved in methanol (1.5 mL). A 2 N aqueous lithium hydroxide solution (0.74 mL, 1.47 mmol) was added, and the mixture was stirred at room temperature for 50 minutes. THF (1 mL) was added, and the mixture was stirred for 19 hours, and then further stirred at 40° C. for 6.5 hours and at 70° C. for two hours. Water was added to the reaction solution, and then the mixture was washed with ethyl acetate. A 1 N aqueous hydrochloric acid solution (2.5 mL) was added to the aqueous layer, followed by extraction with ethyl acetate. The combined organic layers were dried over anhydrous magnesium sulfate and then filtered, and the filtrate was concentrated under reduced pressure. The resulting solid was suspended and washed in diethyl ether to obtain 23 mg of the title compound as a pale blue solid (37%).

Quelle