Methanol → HCID 11547193, compound

Participants

Reaction Steps

Alternatively a solution of 12.5 mmol of trifluoromethanesulfonic anhydride dissolved in 10 ml dichloromethane is added over a period of 20 min to a cooled (ice-water bath) solution of 2.5 mmol of N-[(3R,4R)-3-(3-Ethoxy-4-methoxy-phenyl)-tetrahydro-pyran-4-yl]-N′,N′-diisopropyl-terephthalamide and 7.5 mmol of 4-dimethylamino-pyridine in 30 ml of dichloromethane. The solution is stirred over night and then added to a cooled (ice-water bath) mixture of 10 ml of methanol, 10 ml of triethyl amine and 20 ml of dichloromethane and the mixture is stirred for 1 h. After concentration under reduced pressure the solid residue is purified by column chromatography on SiO2 (di-isopropylether/methanol/triethyl amine 18/1/1 vol/vol/vol), the main product fraction is separated and concentrated yielding the title compound as grayish solid foam. M.p. 98-102° C. (unsharp, enamel-like shrinking starting at about 88° C.)

Provenance & Evidence