[NH:1]1[C:5](=[O:6])[CH2:4][CH2:3][C@H:2]1[C:7]([O:9][CH2:10][C:11]1[CH:16]=[CH:15][CH:14]=[CH:13][CH:12]=1)=[O:8].[H-].[Na+].[C:19](Cl)(=[O:26])[C:20]1[CH:25]=[CH:24][CH:23]=[CH:22][CH:21]=1>C1C=CC=CC=1>[C:19]([N:1]1[C:5](=[O:6])[CH2:4][CH2:3][C@H:2]1[C:7]([O:9][CH2:10][C:11]1[CH:16]=[CH:15][CH:14]=[CH:13][CH:12]=1)=[O:8])(=[O:26])[C:20]1[CH:25]=[CH:24][CH:23]=[CH:22][CH:21]=1A solution of 21.9 g (0.1 mol) of benzyl (L)-pyroglutamate (prepared according to Example II(1)) in 150 ml of benzene is added over an hour to a suspension of 4.8 g (0.1 mol) of sodium hydride in 15 ml of dry benzene. The mixture is stirred for one hour at ordinary temperature and 14.1 g (0.1 mol) of benzoyl chloride diluted in benzene are then introduced. The reaction mixture is stirred for 4 hours at 55° C. and then for 18 hours at ordinary temperature. After the mixture has been washed with water, the solvent evaporated off and the residue taken up with ether, white crystals of melting point=101°/2° C. are obtained; yield=70%; Rf=0.68 (A).
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