Hydrochloric Acid → 4-(2,3-Dimethoxybenzoyl)piperidine hydrochloride
Reaction equation
[CH3:1][O:2][C:3]1[C:23]([O:24][CH3:25])=[CH:22][CH:21]=[CH:20][C:4]=1[C:5]([CH:7]1[CH2:12][CH2:11][N:10](C(OC(C)(C)C)=O)[CH2:9][CH2:8]1)=[O:6].[ClH:26]>O1CCCC1>[ClH:26].[CH3:1][O:2][C:3]1[C:23]([O:24][CH3:25])=[CH:22][CH:21]=[CH:20][C:4]=1[C:5]([CH:7]1[CH2:8][CH2:9][NH:10][CH2:11][CH2:12]1)=[O:6]Participants
4
Reactant 2
Product 1
Reagents, catalysts & solvents 1
Procedure
Into a 25-mL three-neck flask equipped with a thermowell with a thermocouple, a reflux condenser, a stopper, and a magnetic stir bar was placed 4-(2,3-dimethoxybenzoyl)-1-piperidinecarboxylic acid, 1,1-dimethylethyl ester (7) (1.1 g, 3.0 mmol) and 9.7 g of tetrahydrofuran. After 4-(2,3-dimethoxybenzoyl)-1-piperidinecarboxylic acid, 1,1-dimethylethyl ester (7) had dissolved, 6.3 g of 3N aqueous hydrochloric acid was added in one portion. The reaction was stirred to 18 hours at ambient temperature and then heated to 60° C. for 4 hours to give 4-(2,3-dimethoxybenzoyl)piperidine hydrochloride.