[C:1]([O:5][C:6]([N:8]1[CH2:18][CH2:17][C:11]2[N:12]=[C:13]([NH2:16])[N:14]=[CH:15][C:10]=2[CH2:9]1)=[O:7])([CH3:4])([CH3:3])[CH3:2].[CH2:19]([C:21]1[CH:29]=[CH:28][C:24]([C:25](Cl)=[O:26])=[CH:23][CH:22]=1)[CH3:20].[OH-].[Na+].C(Cl)Cl>N1C=CC=CC=1>[C:1]([O:5][C:6]([N:8]1[CH2:18][CH2:17][C:11]2[N:12]=[C:13]([NH:16][C:25](=[O:26])[C:24]3[CH:28]=[CH:29][C:21]([CH2:19][CH3:20])=[CH:22][CH:23]=3)[N:14]=[CH:15][C:10]=2[CH2:9]1)=[O:7])([CH3:4])([CH3:2])[CH3:3]2-Amino-7,8-dihydro-5H-pyrido[4,3-d]pyrimidine-6-carboxylic acid tert-butyl ester 501 mg (2.0 mmol) was added at 0° C. to a solution of 4-ethylbenzoic acid chloride 296 μl (2.0 mmol) in pyridine (25 ml) and stirring was performed for 2 h at 0° C. and then overnight at RT under nitrogen as inert gas. After the addition of aqueous 1 M NaOH (40 ml) and stirring for 20 minutes, CH2Cl2 (50 ml) was added and the aqueous phase extracted with CH2Cl2 (3×20 ml). The combined organic phases were dried over Na2SO4. After filtration and removal of the solvent, purification was performed by means of column chromatography and the product 2-(4-ethyl-benzoylamino)-7,8-dihydro-5H-pyrido[4,3-d]pyrimidine-6-carboxylic acid tert-butyl ester 640 mg (1.67 mmol, 84% of theoretical) was obtained.
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