Acetyl chloride → (R)-3-((S)-1-acetylpyrrolidin-3-yl)-2-(4-(cyclopropylsulfonyl)phenyl)-N-(5-fluorothiazol-2-yl)propanamide

Participants

Reaction Steps

The (R)-2-(4-(cyclopropylsulfonyl)phenyl)-N-(5-fluorothiazol-2-yl)-3-((S)-pyrrolidin-3-yl)propanamide (1.17 g, 2.77 mmol) obtained in Step 1 of Example 2 was dissolved in dichloromethane (27 mL), and thereafter, triethylamine (0.806 mL, 5.81 mmol) and acetyl chloride (0.207 mL, 2.91 mmol) were added to the above obtained solution under ice-cold condition. The obtained mixture was stirred for 20 minutes. Thereafter, the reaction solution was washed with a 1 M aqueous solution of hydrochloric acid and a saturated aqueous solution of sodium hydrogen carbonate. The resultant was dried over anhydrous sodium sulfate, and was then concentrated in vacuo. The obtained residue was purified by silica gel chromatography (chloroform/methanol=1%→15%) to obtain the captioned compound (980 mg, 76%) in the form of a white solid.

Provenance & Evidence