Water → 4-chloro-N-[(3S,4R)-3-ethoxypiperidin-4-yl]-5-methyl-1H-pyrrole-2-carboxamide

Participants

Reaction Steps

A solution of ethyl (3S,4R)-4-{[(4-chloro-5-methyl-1H-pyrrol-2-yl)carbonyl]amino}-3-ethoxypiperidine-1-carboxylate (Intermediate 34, 1.6 g, 4.48 mmol), potassium hydroxide (1.76 g, 31.37 mmol), and hydrazine hydrate (1.6 mL, 31.37 mmol) in ethylene glycol (180 mL) was stirred for 40 h at 120° C. The reaction mixture was poured in to water (120 mL) and extracted with ethyl acetate (2×150 mL). The combined organic extracts were dried over anhydrous sodium sulphate, filtered, concentrated in vacuo to yield the crude product which was triturated with water (30 mL) to afford 4-chloro-N-[(3S,4R)-3-ethoxypiperidin-4-yl]-5-methyl-1H-pyrrole-2-carboxamide 480 mg (37%) as solid.

Provenance & Evidence