反应详情

A solution of 4-carbamoylmethoxypiperidine-1-carboxylic acid tert-butyl ester (Preparation 13, 235 mg, 0.91 mmol) and triethylamine (140 μl, 1 mmol) in anhydrous CH2Cl2 (5 ml) was cooled to 0° C. and a solution of trichloroacetyl chloride (174 mg, 0.96 mmol) in anhydrous CH2Cl2 added dropwise. The reaction mixture was stirred at rt for 1 h, the solvent was removed and the residue purified by flash chromatography (IH-EtOAc, 1:1) to afford the title compound: δH (CDCl3) 1.50 (9H, s), 1.58-1.65 (2H, m), 1.89-1.95 (2H, m), 3.20 (2H, m), 3.74-3.79 (3H, m), 4.33 (2H, s).

1. customthe solvent was removed
2. customthe residue purified by flash chromatography (IH-EtOAc, 1:1)