C1(=O)[N:5]([CH:6]2[CH2:9][N:8]([CH:10]([C:16]3[CH:21]=[CH:20][CH:19]=[CH:18][CH:17]=3)[CH2:11][C:12]([O:14][CH3:15])=[O:13])[C:7]2=[O:22])C(=O)C2=CC=CC=C12.CN(C)CCCN.CO.C(Cl)(Cl)Cl>C(OCC)(=O)C>[NH2:5][CH:6]1[CH2:9][N:8]([CH:10]([C:16]2[CH:21]=[CH:20][CH:19]=[CH:18][CH:17]=2)[CH2:11][C:12]([O:14][CH3:15])=[O:13])[C:7]1=[O:22]3-Phthalimido-1-(2-methoxycarbonyl-1-phenylethyl)-2-azetidinone (1.90 g.) and N,N-dimethyl-1,3-propanediamine (1.14 g.) were added to a mixture of methanol (20 ml.) and chloroform (5 ml.), whereafter the mixture was stirred at ambient temperature for 17 hours. The reaction mixture was evaporated to dryness under reduced pressure to give a residue, which was dissolved in ethyl acetate (20 ml.). The solution was extracted with three portions of an aqueous solution consisting of 1N hydrochloric acid (5.3 ml.) and water (11.3 ml.), and then the combined extract was washed with ethyl acetate. The aqueous solution was adjusted to pH 8 with sodium bicarbonate under ice-cooling and then extracted with three 10 ml. portions of chloroform. The extracts were washed with water and then dried over magnesium sulfate. The solvent was removed by distillation from the solution under reduced pressure to give oily 3-amino-1-(2-methoxycarbonyl-1-phenylethyl)-2-azetidinone (1.030 g.).
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