反应详情

1-Benzylpiperidine-4-carboxylic acid (29 g, 0.13 mol) dissolved in DCM (300 ml), cooled to 0° C. and added oxalyl chloride (17.3 ml, 0.2 mol). Catalytic amount of DMF was added to this mixture and stirred at rt for 2 h. After 2 h, DCM removed on rotavapour and co-distilled the residue two times with DCM to obtain 1-benzylpiperidine-4-carbonyl chloride quantitatively. 2-Amino-4-bromophenol (23 g, 0.12 mol) dissolved in DCM and added pyridine (11.5 g, 0.15 mol) under nitrogen atmosphere. This mixture stirred at rt for 30 mins and added 1-benzylpiperidine-4-carbonyl chloride (29 g, 0.12 mol) in DCM (100 ml). After continuing stirring at rt for 2 h, DCM was removed on the rotavapour to obtain the titled compound (47.6 g), which was used in the next step without further purification.

1. stirringAfter continuing stirring at rt for 2 h
2. customDCM was removed on the rotavapour