Hydrochloric Acid → 7-(4-Ethoxyphenyl)-1,1-dioxo-2,3-dihydro-1-benzothiepine-4-carboxylic acid
Reaction equation
[CH2:1]([O:3][C:4]1[CH:9]=[CH:8][C:7]([C:10]2[CH:11]=[CH:12][C:13]3[S:19](=[O:21])(=[O:20])[CH2:18][CH2:17][C:16]([C:22]([O:24]C)=[O:23])=[CH:15][C:14]=3[CH:26]=2)=[CH:6][CH:5]=1)[CH3:2].Cl>COCCOC>[CH2:1]([O:3][C:4]1[CH:9]=[CH:8][C:7]([C:10]2[CH:11]=[CH:12][C:13]3[S:19](=[O:21])(=[O:20])[CH2:18][CH2:17][C:16]([C:22]([OH:24])=[O:23])=[CH:15][C:14]=3[CH:26]=2)=[CH:6][CH:5]=1)[CH3:2]Participants
4
Procedure
To a solution of methyl 7-(4-ethoxyphenyl)-1,1-dioxo-2,3-dihydro-1-benzothiepine-4-carboxylate (600 mg) in 1,2-dimethoxyethane (40 ml) was added 6N hydrochloric acid (30 ml), and the mixture was refluxed for 7 hours and concentrated under reduced pressure. To the residue was added 2-propanol, and precipitated crystals were collected by filtration. The crystals were dissolved in THF, and the solution was concentrated to give crystals, which were collected by filtration to give pale yellow crystals of 7-(4-ethoxyphenyl)-1,1-dioxo-2,3-dihydro-1-benzothiepine-4-carboxylic acid (507.5 mg).