4-Methylmorpholine → ethyl (3S,4R)-4-{[(3,4-dichloro-5-methyl-1H-pyrrol-2-yl)carbonyl]amino}-3-propoxypiperidine-1-carboxylate

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Reaction Steps

To a solution of 3,4-dichloro-5-methyl-1H-pyrrole-2-carboxylic acid (WO2006087543, 1.77 g, 9.13 mmol) and ethyl (3S,4R)-4-amino-3-propoxypiperidine-1-carboxylate (see Intermediate 73, 2.1 g, 9.13 mmol) in dichloromethane (150 mL) was added N-Hydroxybenzotriazole (1.67 g, 10.95 mmol) and N-methylmorpholine (2.76 g, 27.39 mmol). The reaction mixture was stirred for 1 h at room temperature and 1-Ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride (3.023 g, 16.43 mmol) was added. The resulting reaction mixture was stirred at room temperature overnight. The reaction mixture was quenched with 2N hydrochloric acid (30 mL) and the layers were separated. The organic layer was washed with sodium bicarbonate (40 mL), water (60 mL) and finally with brine successively, and dried over anhydrous sodium sulphate, filtered, and concentrated under vacuum to afford ethyl (3S,4R)-4-{[(3,4-dichloro-5-methyl-1H-pyrrol-2-yl)carbonyl]amino}-3-propoxypiperidine-1-carboxylate 3.3 g (89.1%) as solid.

Provenance & Evidence