Pyridine → N-[(4aR,6R,8aS)-8a-(5-cyano-2-fluorophenyl)-6-cyclopropyl-4,4a,5,6,8,8a-hexahydropyrano[3,4-d][1,3]thiazin-2-yl]benzamide

Participants

Reaction Conditions

Reaction Steps

A solution of N-{[(3S,4R,6R)-3-(5-bromo-2-fluorophenyl)-6-cyclopropyl-4-(hydroxymethyl)tetrahydro-2H-pyran-3-yl]carbamothioyl}benzamide (C57) (127 mg, 0.28 mmol) and pyridine (81 μL, 1.01 mmol) in dichloromethane (12 mL) was cooled to −50° C. Trifluoromethanesulfonic anhydride (94 μL, 0.56 mmol) was added drop-wise to the solution and the mixture was gradually warmed to 0° C. over 90 minutes. The reaction mixture was diluted with dichloromethane (20 mL), washed with water (2×30 mL), dried over magnesium sulfate, filtered, and concentrated in vacuo. Purification via silica gel chromatography (Gradient: 0% to 100% ethyl acetate in heptane) afforded the product as a solid. Yield: 83 mg, 68%. LCMS m/z 436.2 [M+H+].

Provenance & Evidence