Dimethylamine, hydrochloride → L-trans4Hydroxyproline N,N-dimethylamide hydrochloride

Participants

Reaction Steps

To a solution of BOC-hydroxyproline (2.99 g, 13.89 mmol) in dichloromethane (100 ml) were added N,N-diisopropylethylamine (3.7 ml, 21.24 mmol), 4-(dimethylamino)pyridine (1.74 g, 14.24 mmol), dimethylamine hydrochloride (1.72 g, 21.09 mmol) and WSCDI (3.17 g, 16.68 mmol). The mixture was stirred at room temperature for 30 h. The mixture was diluted with dichloromethane (100 ml) and washed with 0.3M KHSO4, saturated sodium bicarbonate solution and brine, dried over MgSO4, and concentrated in vacuo to give a colourless gum. This crude material was taken up in 4N HCl/dioxan (50 ml) and stirred at room temperature for 1 hr and then concentrat d in vacuo. The residue was azeotroped with toluene and diethyl ether to give a white solid; yield 0.45 g (17%).

Provenance & Evidence