Hydrochloric Acid → 1-[(4-{[(Tert-butoxycarbonyl)amino]methyl}piperidin-1-yl)methyl]cyclopentanecarboxylic acid

Participants

Reaction Conditions

Reaction Steps

To a solution of Methyl 1-[(4-{[(tert-butoxycarbonyl)amino]methyl}piperidin-1-yl)methyl]cyclopentanecarboxylate (2.8 g, 8.0 mmol, Step 6) in MeOH (11 mL), 2 N aqueous NaOH solution (6 mL) was added at room temperature (exothermic). The resulting solution was stirred at 70° C. for 4 h, then cooled to 5˜10° C. in ice-cold water bath. To the solution, 5 N HCl aq (6 mL) was added dropwise. The resulting solution (pH value was ca.6) was concentrated and to the residue, 2-propanol (40 mL) was added. This solution was concentrated and to the residue, CH3CN (40 mL) was added. The resulting mixture was stirred at room temperature for 2 h and it was filtered through a Celite pad (5.0 g) to remove NaCl. The filtrate was concentrated to give 2.4 g (quant) of the titled compound as white solid.

Provenance & Evidence