Benzyl Alcohol → 1-tert-butyl 3-methyl(3R,5S)-5-{[(benzyloxy)carbonyl]amino}piperidine-1,3-dicarboxylate

Temperatur

100 °C

(3S,5R)-1-(tert-Butoxycarbonyl)-5-(methoxycarbonyl)piperidine-3-carboxylic acid (2.83 g) was suspended in toluene (36 ml), diphenylphosphoryl azide (2.60 ml) and triethylamine (1.70 ml) were added and the mixture was stirred at 100° C. for 1 hr. The reaction mixture was cooled to room temperature, benzyl alcohol (1.53 ml) and triethylamine (7.00 ml) were added and the mixture was stirred at 80° C. for 3 hr. The reaction mixture was concentrated, the residue was dissolved in ethyl acetate, washed with water, 0.5M hydrochloric acid and saturated brine in this order, and dried over anhydrous magnesium sulfate. The solvent was evaporated under reduced pressure. The residue was subjected to silica gel column chromatography, and a fraction eluted with ethyl acetate-hexane (1:3-3:1) was concentrated under reduced pressure to give the object product (2.79 g) as an oil.

1. temperatureThe reaction mixture was cooled to room temperature
2. stirringthe mixture was stirred at 80° C. for 3 hr
3. concentrationThe reaction mixture was concentrated
4. dissolutionthe residue was dissolved in ethyl acetate
5. washwashed with water, 0.5M hydrochloric acid and saturated brine in this order
6. dry with materialdried over anhydrous magnesium sulfate
7. customThe solvent was evaporated under reduced pressure
8. washa fraction eluted with ethyl acetate-hexane (1:3-3:1)
9. concentrationwas concentrated under reduced pressure

ORD-Eintrag

ord-1ebac7b9de204129b6adc7e6bfe65a11

Quelldatensatz

uspto-grants-2014_03

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08664380B2