[C:1]([O:5][C:6](=[O:9])[CH2:7][NH2:8])([CH3:4])([CH3:3])[CH3:2].[CH3:10][C:11]([CH3:15])([CH3:14])[CH:12]=O>C(Cl)Cl>[C:1]([O:5][C:6](=[O:9])[CH2:7]/[N:8]=[CH:10]/[C:11]([CH3:15])([CH3:14])[CH3:12])([CH3:4])([CH3:3])[CH3:2]In a manner similar to the method described in Example 1a, glycine tert-butyl ester (0.65 g, 5 mmol) was reacted with trimethylacetaldehyde (Aldrich) (0.42 g, 5 mmol) in CH2Cl2 at room temperature for 20 h to give [2,2-dimethyl-prop-(E)-ylideneamino]-acetic acid tert-butyl ester as a colorless oil (1.0 g, 100%).
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