反应详情

To tert-butyl (3S)-3-amino-3-[5-(benzyloxy)pyridin-3-yl]propanoate (1.15 g, 3.5 mmol) in DMF (13.4 mL) was added tert-butyl 4-{3-[(3R)-3-{[(2,5-dioxopyrrolidin-1-yl)oxy]carbonyl}piperidin-1-yl]-3-oxopropyl}piperidine-1-carboxylate and triethylamine (1.46 mL, 10.5 mmol) in dichloromethane (13.5 mL) at 0° C. After 3 hours the mixture was quenched by addition of saturated aqueous ammonium chloride solution, phases were separated and the aqueous phase was extracted with diethyl ether. Combined organic extracts were dried over sodium sulphate, concentrated under reduced pressure and the residue was purified by chromatography on silica gel (ethyl acetate in hexane, 20 to 100% followed by methanol in ethyl acetate 0 to 20%) to yield 1.76 g tert-butyl 4-{3-[(3R)-3-({(1S)-1-[5-(benzyloxy)pyridin-3-yl]-3-tert-butoxy-3-oxopropyl}carbamoyl)piperidin-1-yl]-3-oxopropyl}piperidine-1-carboxylate.

1. customAfter 3 hours the mixture was quenched by addition of saturated aqueous ammonium chloride solution, phases
2. customwere separated
3. extractionthe aqueous phase was extracted with diethyl ether
4. dry with materialCombined organic extracts were dried over sodium sulphate
5. concentrationconcentrated under reduced pressure
6. customthe residue was purified by chromatography on silica gel (ethyl acetate in hexane, 20 to 100% followed by methanol in ethyl acetate 0 to 20%)