Hydrochloric Acid → HCID 54244781, compound

Participants

Reaction Steps

A solution of 7-methoxy-8-fluoro-isochroman-4-one from Step 2 (370 mg, 1.76 mmol) and ethyl trifluoroacetate (290 mg, 2.04 mmol) in 8 mL of anhydrous tetrahydrofuran was treated with a solution of 25% sodium methoxide in methanol (570 mg, 2.64 mmol). The solution was stirred at room temperature for 16 hours, treated with excess 3N hydrochloric acid, and extracted with ether. The ethereal extract was washed with brine, dried over anhydrous MgSO4, filtered and concentrated in vacuo to afford 450 mg (88%) of pure 7-methoxy-8-fluoro-3-(trifluoroacetyl)isochroman-4-one which was used directly in the next step without further purification.

Provenance & Evidence