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

Participants

Reaction Conditions

Reaction Steps

(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, and the residue was dissolved in ethyl acetate, washed with water, 0.5 M hydrochloric acid, saturated aqueous sodium hydrogen carbonate 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 the fraction eluted with ethyl acetate-hexane (1:3-3:1) was concentrated under reduced pressure to give the object compound (2.78 g) as an oil.

Provenance & Evidence