Isopropanol → HCID 22731978, compound
Reaction equation
[OH-].[K+].[Cl:3][C:4]1[CH:5]=[C:6]2[C:11](=[CH:12][CH:13]=1)[S:10][CH2:9][CH2:8][C:7]2([C:15](N)=[O:16])[OH:14].C([OH:21])(C)C>O>[Cl:3][C:4]1[CH:5]=[C:6]2[C:11](=[CH:12][CH:13]=1)[S:10][CH2:9][CH2:8][C:7]2([C:15]([OH:16])=[O:21])[OH:14]Participants
5
Reactant 3
Product 1
Reagents, catalysts & solvents 1
Procedure
Potassium hydroxide (5.1 g, 91 mmol) and 6-chloro-4-hydroxythiochromane-4-yl-carboxamide (1.36 g, 5.58 mmol; from step (ii) above) were dissolved in water (25 mL) and isopropanol and refluxed for 2 d. The isopropanol was removed under reduced pressure and the aqueous residue was washed with diethyl ether. Acidification with aq. HCl, extraction with ethyl acetate, and then drying and concentration in vacuo afforded the sub-title compound. Yield: 0.87 g (64%).