Methanol → Methyl 4-(piperidin-2-yl)butanoate hydrochloride
Reaction equation
Cl.[NH:2]1[CH2:7][CH2:6][CH2:5][CH2:4][CH:3]1[CH2:8][CH2:9][CH2:10][C:11]([OH:13])=[O:12].S(Cl)([Cl:16])=O.[CH3:18]O>>[ClH:16].[NH:2]1[CH2:7][CH2:6][CH2:5][CH2:4][CH:3]1[CH2:8][CH2:9][CH2:10][C:11]([O:13][CH3:18])=[O:12]Participants
4
Procedure
A solution of 4-(2-piperidinyl)butanoic acid hydrochloride (5.95 g, 34.8 mmol) in Methanol (104 ml) is cooled to 0° C. At this temperature thionylchloride (7.54 ml, 104.3 mmol) is added slowly. The reaction mixture is heated to reflux for 12 h. The solvent is evaporated in vacuum. The residue is suspended in ethylacetate and is heated to reflux. The suspension is filtered while it is still hot. In the filtrate a white solid dropped out, which was filtered out and dried in vacuum to give Methyl 4-(piperidin-2-yl)butanoate hydrochloride (2) (3.49 g, 45%)