Hydrochloric Acid → Quinoline-6-thiol
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Br[C:2]1[CH:3]=[C:4]2[C:9](=[CH:10][CH:11]=1)[N:8]=[CH:7][CH:6]=[CH:5]2.C[S-:13].[Na+].Cl>CN(C)C(=O)C.C(OCC)(=O)C>[N:8]1[C:9]2[C:4](=[CH:3][C:2]([SH:13])=[CH:11][CH:10]=2)[CH:5]=[CH:6][CH:7]=1Br[C:2]1[CH:3]=[C:4]2[C:9](=[CH:10][CH:11]=1)[N:8]=[CH:7][CH:6]=[CH:5]2.C[S-:13].[Na+].Cl>CN(C)C(=O)C.C(OCC)(=O)C>[N:8]1[C:9]2[C:4](=[CH:3][C:2]([SH:13])=[CH:11][CH:10]=2)[CH:5]=[CH:6][CH:7]=1To a solution of 6-bromoquinoline (0.81 g, 3.89 mmol) in N,N-dimethylacetamide (4 mL) was added sodium methyl mercaptide (2.0 g, 28.5 mmol). The mixture was heated at 150° C. for 2 h. After cooling, the mixture was diluted with ethyl acetate, and neutralized with aqueous 1N hydrochloric acid. The organic layer was separated and the aqueous layer was extracted with ethyl acetate. The combined organic extracts were washed with water and brine, dried over magnesium sulfate, filtered, and concentrated under reduced pressure. The residue was directly used in the next step without further purification. (0.50 g, 79%) LCMS: (M+H)+=161.9.
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