[Cl:1][C:2]1[N:3]=[CH:4][CH:5]=[C:6]2[C:11]=1[N:10]=[CH:9][C:8]([OH:12])=[CH:7]2.Br[C:14]#[C:15][CH2:16][CH3:17].C(=O)([O-])[O-].[Cs+].[Cs+]>CN(C=O)C>[CH2:14]([O:12][C:8]1[CH:9]=[N:10][C:11]2[C:6]([CH:7]=1)=[CH:5][CH:4]=[N:3][C:2]=2[Cl:1])[C:15]#[C:16][CH3:17]To a solution of 8-chloro-1,7-naphthyridin-3-ol (618 mg, 3.42 mmol) in DMF (11 ml) were added bromobutyne (882 mg, 6.67 mmol), cesium carbonate (3233 mg, 9.92 mmol). The reaction mixture was heated at 50° C. for 0.5 h. It was quenched with water, and light brown precipitate was formed. It was then collected by Buchner funnel to yield 3-(but-2-yn-1-yloxy)-8-chloro-1,7-naphthyridine (550 mg, 74% yield) as light brown solid. MS m/z: 233.1 [M+H].
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