methyl 4-(tert-butyl)-2-(1-Boc-piperidin-4-yloxy)benzoate → 2-(N-Boc-piperidine-4-yloxy)-4-(tert-butyl)benzoic acid

Participants

Reaction Conditions

Reaction Steps

In a 50 ml RBF was suspended methyl 2-(1-tert-butoxycarbonylpiperidin-4-yloxy)-4-tert-butylbenzoate (2.4 g, 6.1 mmol) in 25 ml of 3:1 THF:water to give a light emulsion, then was added solid LiOH monohydrate (567 mg, 13.5 mmol), the flask was fitted with a reflux condenser, and the mixture was heated at 50° C. with stirring for 16 h. The mixture was diluted with 75 ml water and washed twice with diethyl ether. The aqueous layer was acidified to about pH 2 with 1 N NaHSO4, and the resulting slurry extracted twice with 100 ml portions of EtOAc. The combined EtOAc layers were washed with brine, dried, then concentrated in vacuo to afford 2.1 g (91%) of the title acid as a brittle white foam.

Provenance & Evidence