A new series of optically active antifungal azoles, N-[(1R, 2R)-2-(2, 4-difluorophenyl)-2- hydroxy-1-methyl-3-(1H-1, 2, 4-triazol-1-yl) propyl]-N'-(4-substituted phenyl)-3 (2H, 4H)-1, 2, 4-triazolones (1, 2) and 5 (1H, 4H)-tetrazolones (3), were prepared from the triflate derivative of (1S)-1-[(2R)-2-(2, 4-difluorophenyl)-2-oxiranyl] ethanol (13) by an SN2 displacement reaction with the anion of an azolone (17-19) and subsequent ring-opening reaction with ...