反应详情

To a solution of 4-chloro-3-cyano-5-methyl-1H-pyrrole-2-carboxylic acid (Intermediate 16, 562 mg, 3.07 mmol) and ethyl (3S,4R)-4-amino-3-(prop-2-en-1-yloxy)piperidine-1-carboxylate (Intermediate 18, 700 mg, 3.07 mmol) in dichloromethane (150 mL) were added HOBt (470 mg, 3.07 mmol) and N-methyl morpholine (1.01 mL, 9.21 mmol). The reaction mixture was stirred for 1 h at room temperature and EDC HCl (1.05 g, 5.52 mmol) was added. The resulting reaction mixture was stirred at room temperature overnight. The reaction mixture was quenched with the addition of 2 N HCl (100 mL). The organic layer was washed with sodium bicarbonate (150 mL), water (150 mL) and brine, and dried over anhydrous sodium sulphate, filtered, and concentrated under vacuum. Purification by column chromatography (silica, 35% ethyl acetate in pet ether) afforded Ethyl (3S,4R)-4-{[(4-chloro-3-cyano-5-methyl-1H-pyrrol-2-yl)carbonyl]amino}-3-(prop-2-en-1-yloxy)piperidine-1-carboxylate 1.1 g (90%) as brown solid.

1. customThe resulting reaction mixture
2. stirringwas stirred at room temperature overnight
3. customThe reaction mixture was quenched with the addition of 2 N HCl (100 mL)
4. washThe organic layer was washed with sodium bicarbonate (150 mL), water (150 mL) and brine
5. dry with materialdried over anhydrous sodium sulphate
6. filtrationfiltered
7. concentrationconcentrated under vacuum
8. customPurification by column chromatography (silica, 35% ethyl acetate in pet ether)