Cl.[CH3:2][O:3][C:4](=[O:8])[C@H:5]([CH3:7])[NH2:6].C(N(CC)CC)C.Cl[C:17]1[C:22]([N+:23]([O-:25])=[O:24])=[CH:21][CH:20]=[C:19]([Cl:26])[N:18]=1>CN(C)C=O>[CH3:2][O:3][C:4](=[O:8])[C@H:5]([CH3:7])[NH:6][C:17]1[C:22]([N+:23]([O-:25])=[O:24])=[CH:21][CH:20]=[C:19]([Cl:26])[N:18]=1L-Alanine methyl ester hydrochloride (8.4 g, 0.06 mol) was dissolved in 100 ml of anhydrous N,N-dimethylformamide, and 16.6 ml (0.12 mol) of triethylamine were added. Subsequently, while stirring vigorously, 10.7 g (0.05 mol) of 2,6-dichloro-3-nitropyridine in 20 ml of anhydrous N,N-dimethylformamide were slowly added dropwise, during which the reaction temperature rose above 40° C. After a further 3 h at room temperature, the reaction mixture was poured into about 400 ml of ice-water, extracted three times with ethyl acetate, dried (sodium sulfate) and concentrated. After chromatography on silica gel (ethyl acetate/heptane=1:5 then 1:2), 9.0 g (69%) of compound A were isolated as a yellow oil,
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