Ethyl 4-piperidinecarboxylate → 1-(6-Benzyl-4,5-dimethyl-pyridazin-3-yl)-piperidine-4-carboxylic acid ethyl ester

Participants

Reaction Conditions

Reaction Steps

To a solution of 3-benzyl-6-chloro-4,5-dimethyl-pyridazine (1.0 g, 4.31 mmol) in NMP (10 mL) is added piperidine-4-carboxylic acid ethyl ester (2.0 g, 12.9 mmol) and DIPEA (3.7 mL, 21.6 mmol). The mixture is heated in microwave at 210° C. for 1.5 h. The mixture is concentrated at 80° C. by rotovaporation. The crude product is purified by HPLC (CH3CN/H2O: 22%˜45% with 0.1% TFA) to give 1-(6-benzyl-4,5-dimethyl-pyridazin-3-yl)-piperidine-4-carboxylic acid ethyl ester (0.94 g, 61%).

Provenance & Evidence