Acetonitrile → 1-[(2R,3R)-2-(2,4-difluorophenyl)-2-hydroxy-3-[2-oxo-3-[4-(1H-tetrazol-1-yl)phenyl]-1-imidazolidinyl]butyl]-4-propoxycarbonyloxymethyl-1H-1,2,4-triazolium chloride

Participants

Reaction Conditions

Reaction Steps

A mixture of 1-[(1R,2R)-2-(2,4-difluorophenyl)-2-hydroxy-1-methyl-3-(1H-1,2,4-triazol-1-yl)propyl]-3-[4-(1H-tetrazol-1-yl)phenyl]-2-imidazolidinone (0.5 g), chloromethyl propyl carbonate (3.2 g) and acetonitrile (1 ml) was stirred for 12 hours at 100° C. After having been cooled, the mixture was diluted with diisopropyl ether (10 ml), and the resulting powder was collected by filtration. The powder was subjected to silica gel chromatography (eluent: ethyl acetate→acetone→acetone/ethanol=10/1→acetone/ethanol=5/1). The solvent was distilled off, and the residue was subjected to ODS column chromatography (eluent: methanol/water=3/2) to give 1-[(2R,3R)-2-(2,4-difluorophenyl)-2-hydroxy-3-[2-oxo-3-[4-(1H-tetrazol-1-yl)phenyl]-1-imidazolidinyl]butyl]-4-propoxycarbonyloxymethyl-1H-1,2,4-triazolium chloride (Compound 19, 0.02 g) as a white powder.

Provenance & Evidence