[NH2:1][CH2:2][CH2:3][CH2:4][CH2:5][C:6]([OH:8])=[O:7].O.[C:10]1([CH3:20])[CH:15]=[CH:14][C:13]([S:16]([OH:19])(=[O:18])=[O:17])=[CH:12][CH:11]=1.C1C=CC=CC=1.[CH2:27](O)[C:28]1[CH:33]=[CH:32][CH:31]=[CH:30][CH:29]=1>O>[C:10]1([CH3:20])[CH:11]=[CH:12][C:13]([S:16]([OH:19])(=[O:17])=[O:18])=[CH:14][CH:15]=1.[CH2:27]([O:7][C:6](=[O:8])[CH2:5][CH2:4][CH2:3][CH2:2][NH2:1])[C:28]1[CH:33]=[CH:32][CH:31]=[CH:30][CH:29]=111.7 Parts 5-aminopentanoic acid and 22.8 parts p-toluenesulfonic acid monohydrate is suspended in 180 parts benzene and 32.4 parts benzyl alcohol is added. A continuous water separator is attached to the flask and the mixture stirred at vigorous reflux temperature for 16 hours. After cooling to room temperature, the solvent is removed under reduced pressure and the residual oil shaken with n-hexane. The supernatant is discarded and the gummy product rubbed with ethyl ether causing crystallization to take place. The solid is separated, by filtration and washed with ethyl ether to afford the desired 5-aminopentanoic acid benzyl ester p-toluenesulfonate.
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