Pyridine → HCID 20083178, compound

Participants

Reaction Steps

2.8 g of the compound (169) obtained in Example 46 was added to 10 ml of pyridine, and while cooling on ice, 2.35 ml of trifluoromethanesulfonic anhydride was added to the solution through 20 minutes. The solution was stirred for 24 hours at room temperature. 200 ml of chloroform was added to the solution, and the solution was washed with aqueous 5% citric acid solution. The organic layer was separated and after drying over magnesium sulfate, the solvent was removed by distillation. To the residue, ethanol was added, and the solid matter was filtered off and purified by column chromatography (silica gel, eluent solvent; chloroform:ethyl acetate=1:1). The solid matter was filtered off and washed with isopropyl ether to obtain 1.2 g of the subject compound (170).

Provenance & Evidence