Pipecolic Acid → 1-(3-Benzyloxybenzoyl)-2-piperidinecarboxylic acid

Participants

Reaction Steps

Triethylamine (3.36 ml) was added to a stirred solution of 3-benzyloxybenzoic acid (5.0 g) and isobutyl chloroformate (3.13 ml) in THF (67 ml) under ice-cooling and the resulting mixture was stirred at the same temperature for 1 hour. A solution of 2-piperidinecarboxylic acid (4.14 g) and NaHCO3 (3.32 g) in water (40 ml) was added dropwise to the stirred mixture at the same temperature and the mixture was stirred at the same temperature for 2 hours and at room temperature overnight. The reaction mixture was partitioned between ethyl acetate and 1N HCl. The organic layer was separated, washed with 1N HCl (twice) and brine, dried over MgSO4, and evaporated in vacuo. The residue was chromatographed over silica gel to afford 1-(3-benzyloxybenzoyl)-2-piperidinecarboxylic acid (2.01 g) as a amorphous powder. (+) APCI-MS (m/z): 340 (M+ +1) IR (Nujol): 2590, 1710, 1595, 1575, 1230 cm-1

Provenance & Evidence