[CH2:1]([O:3][C:4](=[O:11])[CH2:5][NH:6][C:7]([O:9][CH3:10])=[O:8])[CH3:2].C=O.[C:14](OC(=O)C)(=O)C.[P:21]([O:36][C:37]1[CH:42]=[CH:41][CH:40]=[CH:39][CH:38]=1)([O:29][C:30]1[CH:35]=[CH:34][CH:33]=[CH:32][CH:31]=1)[O:22]C1C=CC=CC=1>C(O)(=O)C>[CH2:1]([O:3][C:4](=[O:11])[CH2:5][N:6]([C:7]([O:9][CH3:10])=[O:8])[CH2:14][P:21]([O:36][C:37]1[CH:42]=[CH:41][CH:40]=[CH:39][CH:38]=1)([O:29][C:30]1[CH:35]=[CH:34][CH:33]=[CH:32][CH:31]=1)=[O:22])[CH3:2]A mixture of N-carbomethoxy glycine ethyl ester (10.0 g, 0.06 mole), paraformaldehyde (2.0 g, 0.06 mole), acetic anhydride (96%, 4.0 g, 0.06 mole) and acetic acid (20 ml) was stirred for 3 hrs. at 60°-70° C. under nitrogen. Triphenyl phosphite (19.2 g, 0.03 mole) was slowly added then the reaction mixture was refluxed for 2 hrs. at 110°-200° C. The reaction was cooled and the solvent was evaporated under vacuum. The resulting oily material was dissolved in chloroform and washed with water. The product was confirmed by nmr. Yield 70.5%.
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