Optically Active Antifungal Azoles. VII. Synthesis and Antifungal Activity of Stereoisomers of 2-((1R,2R)-2-(2,4-Difluorophenyl)-2-hydroxy-1-methyl-3-(1H-1,2,4-triazol-1-yl)propyl)-4-(4-(2,2,3,3-tetrafluoropropoxy)phenyl)-3(2H,4H)-1,2,4-triazolone (TAK-187).

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Abstract
2-[(1R,2R)-2-(2,4-Difluorophenyl)-2-hydroxy-1-methyl-3-(1H-1,2, 4-triazol-1-yl)propyl]-4-[4-(2,2,3,3,tetrafluoropropoxy) phenyl]-3(2H, 4H)-1,2,4-triazolone [(1R,2R)-1: TAK-187] is a new antifungal agent selected as a candidate for clinical trials. The three stereoisomers [(1S,2S)-, (1R,2S)- and (1S,2R)-1] of this compound were prepared to clarify the relationship between the stereochemistry and the biological activities. In vitro and in vivo assays of antifungal activity revealed that TAK-187 [(1R,2R)-1] is the most potent among the four stereoisomers. Furthermore, TAK-187 was found to exert strong and selective inhibitory effect on the sterol synthesis in Candida albicans as compared with that in rat liver.

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