[C:1]1([C:7]([C:15]2[CH:20]=[CH:19][CH:18]=[CH:17][CH:16]=2)([C:9]2[CH:14]=[CH:13][CH:12]=[CH:11][N:10]=2)O)[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1.C([Cl:24])(=O)C>S(Cl)(Cl)=O>[ClH:24].[Cl:24][C:7]([C:15]1[CH:20]=[CH:19][CH:18]=[CH:17][CH:16]=1)([C:1]1[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1)[C:9]1[CH:14]=[CH:13][CH:12]=[CH:11][N:10]=1To a mixture of diphenyl(pyridin-2-yl)methanol (4 g, 0.015 mol) in thionylchloride (50 mL) was added acetylchloride (15 mL, 0.195 mol) at RT and heated to 50° C. for 48 h. The reaction mixture was concentrated under vacuum and the residue was azeotroped with dry benzene (100 mL×2) to give the title compound as the hydrochloride salt (4.4 g, >95%).
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