Acetic Acid → C,C,C-Trifluoro-N-[3-(6-hydroxy-2-methyl-4-oxo-4H-chromen-3-yl-methyl)phenyl]methanesulfonamide

Participants

Reaction Steps

A mixture of 2.1 g (4.91 mmole) of the product from Example 125, 25 mL 48% hydrobromic acid and 25 mL glacial acetic acid was refluxed for 18 hours. The mixture was poured into a stirred slurry of ice and water and stirred for 1 hour. The mixture was filtered, and the filtrant washed with water and dried to give a solid. Flash chromatography on silica gel eluting with 5% methanol in dichloromethane afforded 1.89 g (93%) the title product as a solid, mp 232°-234° C.

Provenance & Evidence