Hydrochloric Acid → Boc-Leu-Pro-OH

Participants

Reaction Steps

BOC-Leu-Pro-OBzl (82.76 g, 0.252 mM) was dissolved in methanol (600 ml). 1 N NaOH (327.6 ml, 1.3 molar excess) was added dropwise with ice cooling, and the mixture was stirred for one hour at room temperature. 1 N HCl (6 ml) was added to the reaction mixture with ice cooling, then the methanol was distilled off in vacuo. After washing the water layer with benzene and ethyl acetate, 1 N HCl (260 ml) was added with ice cooling to form an oily material which was extracted with ethyl acetate. The extract was washed with saturated sodium chloride solution and water and dried with anhydrous sodium sulfate. The solution was dried in vacuo and the residue was dissolved in benzene and lyophilized to obtain the substance [11] (58.57 g, yield: 70.8%).

Provenance & Evidence