[Cl:1][C:2]1[CH:3]=[CH:4][C:5]2[N:6]=[CH:7][N:8]=[C:9](OC3CCOCC3)[C:10]=2[N:11]=1.[CH:19]1([SH:25])[CH2:24][CH2:23][CH2:22][CH2:21][CH2:20]1.C([O-])([O-])=O.[K+].[K+]>C(#N)C.O>[Cl:1][C:2]1[CH:3]=[CH:4][C:5]2[N:6]=[CH:7][N:8]=[C:9]([S:25][CH:19]3[CH2:24][CH2:23][CH2:22][CH2:21][CH2:20]3)[C:10]=2[N:11]=1To a solution of 4,6-dichloropyrido[3,2-d]pyrimidine (Intermediate 1, step D) (0.1 g, 0.500 mmol) in ACN (2.500 ml) were added cyclohexanethiol (0.058 g, 0.500 mmol) and K2CO3 (0.069 g, 0.500 mmol) at room temperature. After stirring overnight at room temperature, the reaction mixture was diluted with water and extracted with EtOAc (2×50 mL). The combined organic layers were washed with 1N aq. NaOH and then washed with 1N aq. HCl. The organic layers were dried over anhydrous MgSO4, filtered and concentrated in vacuo. The residue was purified by column chromatography on SiO2 (Hex:EtOAc=5:1) to give 6-chloro-4-(cyclo hexylthio)pyrido[3,2-d]pyrimidine (0.129 g, 92%) as a yellow solid. 1H-NMR (CDCl3, Varian 400 MHz) δ 1.36-1.42 (1H, m), 1.48-1.69 (5H, m), 1.80-1.86 (2H, m), 2.14-2.20 (2H, m), 4.10-4.16 (1H, m), 7.73 (1H, d, J=8.8 Hz), 8.19 (1H, d, J=8.8 Hz), 8.98 (1H, s).
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