Sodium Hydroxide → 2-[(3S,4R)-4-{[(3,4-dichloro-5-methyl-1H-pyrrol-2-yl)carbonyl]amino}-3-ethoxy piperidin-1-yl]-4-[5-(piperidin-1-yl)pyrazin-2-yl]-1,3-thiazole-5-carboxylic acid

Participants

Reaction Steps

To the solution of ethyl 2-[(3S,4R)-4-{[(3,4-dichloro-5-methyl-1H-pyrrol-2-yl)carbonyl]amino}-3-ethoxypiperidin-1-yl]-4-[5-(piperidin-1-yl)pyrazin-2-yl]-1,3-thiazole-5-carboxylate (Example 67, 120 mg, 0.188 mmol) in methanol (20 mL) was added 2N sodium hydroxide (3 mL) in a dropwise fashion at 0° C. The reaction mixture was stirred overnight and then concentrated under reduced pressure to dryness. The resulting residue was diluted with water (20 mL) and extracted with ethyl acetate to remove any organic impurities. The aqueous layer was passed through celite bed and acidified with 2N hydrochloric acid. The precipitated product was collected by filtration and dried to afford 35 mg (31.8%) of 2-[(3S,4R)-4-{[(3,4-dichloro-5-methyl-1H-pyrrol-2-yl)carbonyl]amino}-3-ethoxy piperidin-1-yl]-4-[5-(piperidin-1-yl)pyrazin-2-yl]-1,3-thiazole-5-carboxylic acid as a yellow solid.

Provenance & Evidence