No significant inhibition effect was observed for triazole 13
(R2 = phenyl substituent); however, triazoles bearing R2 as phenoxymethyls
(14–18) displayed the inhibition effect with IC50
values in the range of 2.9–9.4 lM. Among these compounds,
4-nitrophenoxymethyl (R2) analog 17 (IC50 = 2.9 lM) exerted the
highest activity having comparable IC50 value with that of the ketoconazole
(IC50 = 2.6 lM). When the phenyl group of compound 14
was replaced with naphthalenyl rings as found in compounds 19
and 20, and with a 4-coumarinyl ring as found in compound 22,
the enhanced inhibitory potency was observed. In comparison
between 4-coumarinyl of open-chain (22) and restricted THIQ
(26) analogs (R1 = H), the activity was noted for compound 22
(IC50 = 1.8 lM) but not for compound 26 (IC50 >12.5 lM).
Apparently, the triazoles 20 and 22 exerted inhibition activity
higher than that of the ketoconazole. On the other hand, the