Chloroform → HCID 58499943, compound

Participants

Reaction Steps

To a chloroform (293 ml) solution of the [(R)-1-(4-ethyl-5-methylsulfanyl-4H-[1,2,4]triazol-3-yl)ethyl]-carbamic acid t-butyl ester (21.0 g) obtained in Example 8-(4), m-perchlorobenzoic acid (43.0 g) was added in four portions while being cooled with ice. The mixture was stirred for 3 hours at room temperature, and then stirred for 1 hour at 40° C. To the reaction mixture, Na2S2O3 (12.9 g) and an aqueous solution (300 ml) of sodium hydroxide (1 mol/liter) were added. The organic layer was separated, and washed with a saturated aqueous solution of sodium chloride. The organic layer was dried over anhydrous magnesium sulfate, and then the solvent was distilled off under reduced pressure. The resulting residue was purified by silica gel flash column chromatography using a solvent mixture of hexane and ethyl acetate. Then, the purified substance was recrystallized using hexane and chloroform to obtain [(R)-1-(4-ethyl-5-methanesulfonyl-4H-[1,2,4]triazol-3-yl)ethyl]-carbamic acid t-butyl ester as a white powder (17.2 g).

Provenance & Evidence