Hydrochloric Acid → 2,2-Dimethyl-7-(2-dimethylaminoethoxy)-4-phenyl-2H-chromene

반응식

[C:1]1([Mg]Br)[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1.[CH3:9][C:10]1([CH3:27])[CH2:19][C:18](=O)[C:17]2[C:12](=[CH:13][C:14]([O:21][CH2:22][CH2:23][N:24]([CH3:26])[CH3:25])=[CH:15][CH:16]=2)[O:11]1.Cl>C1COCC1>[CH3:9][C:10]1([CH3:27])[CH:19]=[C:18]([C:1]2[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=2)[C:17]2[C:12](=[CH:13][C:14]([O:21][CH2:22][CH2:23][N:24]([CH3:26])[CH3:25])=[CH:15][CH:16]=2)[O:11]1

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실험 절차

To a stirred solution of phenylmagnesium bromide [from bromobenzene and magnesium in dry tetrahydrofuran] was added 2,2-dimethyl-7-(2-dimethylaminoethoxy)-chroman-4-one in dry THF and the resulting solution was boiled under reflux for 2 weeks. The cooled reaction mixture was decomposed with 2.5 N hydrochloric acid and the organic layer separated and dried (magnesium sulphate). Removal of the solvent gave a yellow oil which was chromatographed on silica in 3% ether - 97% light petroleum (b.p. 60°-80°) gave the title compound as a colourless oil. Dissolution in dry ether and passage of dry hydrogen chloride through the solution gave the hydrochloride salt, m.p. 186.5°-187.5°. An analogous procedure yielded 7-(2-N-benzyl-N-methyl-aminoethoxy)-4-(4-fluorophenyl)-2,2-dimethyl-2H-chromene as a colourless oil.