O[C:2]1[C:3]2[CH:11]=[CH:10][CH:9]=[N:8][C:4]=2[N:5]=[CH:6][N:7]=1.P(Cl)(Cl)(Cl)=O.[NH2:17][CH:18]1[CH2:26][C:25]2[C:20](=[CH:21][CH:22]=[CH:23][CH:24]=2)[CH2:19]1.C(N(CC)CC)C>O1CCOCC1>[CH2:19]1[C:20]2[C:25](=[CH:24][CH:23]=[CH:22][CH:21]=2)[CH2:26][CH:18]1[NH:17][C:2]1[C:3]2[CH:11]=[CH:10][CH:9]=[N:8][C:4]=2[N:5]=[CH:6][N:7]=1Using 4-hydroxypyrido[2,3-d]pyrimidine (150 mg, 1.0 mmol) (see J. Am. Chem. Soc., 77, 2256 (1955)), phosphorus oxychloride (1.0 ml), 2-aminoindan (270 mg, 2.0 mmol), triethylamine (1.4 ml, 10 mmol), and dry dioxane (5 ml), a similar procedure to Example 14 was carried out. The product obtained was purified by silica gel chromatography (ethyl acetate:methanol=19:1) to obtain the title compound (60 mg, 0.23 mmol) having the following physical properties:
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