Dichloromethane → Tert-butyl 4-(2-hydroxyphenyl)piperidine-1-carboxylate

Participants

Reaction Steps

A solution of the hydrobromide salt of 2-piperidin-4-yl-phenol Compound 3a (5.00 g, 19.37 mmol) in water (400 mL) was made basic to pH 8 by the addition of NaHCO3. A solution of O(Boc)2 (4.22 g, 19.36 mmol) in THF (80 mL) was added and the mixture was stirred at r.t. over night. CH2Cl2 (500 mL) was added and the organic layer was isolated and dried. The crude product was purified by chromatography to provide 4-(2-hydroxy-phenyl)-piperidine-1-carboxylic acid tert-butyl ester Compound 2a (4.56 g, 85%) as a white powder 1H NMR δ 1.50 (s, 9H), 1.60 (m, 2H), 1.85 (bd, J=19.5 Hz, 2H), 2.82 (bm, 2H), 3.04 (m, 1H), 4.23 (bs, 2H), 6.7˜7.2 (m, 4H).

Provenance & Evidence