反应详情

1.44 g of sodium borohydride and 0.77 g of molybdenum oxide are added with stirring and under an inert atmosphere, at a temperature in the region of −5° C., to a solution of 2.05 g of methyl (3R,4R)-1-[3-(2,3,5-trifluorophenyl)prop-2-ynyl]-4-[3-hydroxyimino-3-(6-methoxyquinolin-4-yl)propyl]piperidine-3-carboxylate in 100 cm3 of methanol. After 5 hours at a temperature in the region of 20° C., the mixture is concentrated under reduced pressure (5 kPa) at a temperature in the region of 40° C. The residue is purified by chromatography at atmospheric pressure on a column of silica gel (particle size 20-45μ; mass 30 g), elution being carried out with a dichloromethane/methanol/triethylamine (89/10/1 by volume) mixture. Fractions 3 to 5 (containing the purified product) are combined and then concentrated to dryness under the above conditions. 0.9 g of methyl (3R,4R)-1-[3-(2,3,5-trifluorophenyl)prop-2-ynyl]-4-[3-(R,S)-amino-3-(6-methoxyquinolin-4-yl)propyl]piperidine-3-carboxylate is obtained.

1. concentrationthe mixture is concentrated under reduced pressure (5 kPa) at a temperature in the region of 40° C
2. customThe residue is purified by chromatography at atmospheric pressure on a column of silica gel (particle size 20-45μ; mass 30 g), elution
3. additionFractions 3 to 5 (containing the purified product)
4. concentrationconcentrated to dryness under the above conditions