Thiophene containing trisubstituted methanes [TRSMs] as identified lead against Mycobacterium tuberculosis
摘要:
Triarylmethanes (TRAMs) and thiophene containing trisubstituted methanes (TRSMs) have been reported by us, having potential against Mycobacterium tuberculosis and Mycobacterium fortuitum strains, respectively. Further, extension through synthesis and biological evaluation of novel TRSMs resulted into an identified lead 36 (S006-830) [(diisopropyl-(2-{4-[(4-methoxy-phenyl)- thiophen-2-yl-methyll-phenoxy}-ethyl)-amine)] with MIC: 1.33 mg/L, non-toxic against Vero C-1008 cell line with selectivity index >10, ex vivo efficacy equivalent to first line TB drugs-isoniazid (INH), rifampicin (RFM) and pyrazinamide (PZA) in the mouse and human macrophages, and lung CFU count of 2.2 x 10(7) (approximately 15 fold lesser than untreated mice, 31 x 10(7)) with efficacies comparable to ethambutol (EMB) (1.27 x 10(7)) and PZA (1.9 x 10(7)). Further, S006-830 also showed potent bactericidal activity against multi-drug resistant and single-drug resistant clinical isolates of M. tuberculosis. (C) 2015 Elsevier Masson SAS. All rights reserved.
Novel 1-[2-(Diarylmethoxy)ethyl]-2-methyl-5-nitroimidazoles as HIV-1 Non-Nucleoside Reverse Transcriptase Inhibitors. A Structure−Activity Relationship Investigation
摘要:
1-[2-(Diarylmethoxy)ethyl]-2-methyl-5-nitroimidazoles (DAMNIs) is a novel family of HIV-1 non-nucleoside reverse transcriptase inhibitors (NNRTIs) active at submicromolar concentration. Replacement of one phenyl ring of 1-[2-(diphenylmethoxy)ethyl]-2-methyl-5-nitroimidazole (4) with heterocyclic rings, such as 2-thienyl or 3-pyridinyl, led to novel DAMNIs with increased activity. In HIV-1 WT cell-based assay the racemic 1-{2-{alpha-(thiophen-2-yl)phenylmethoxylethyl}-2-methyl-5-nitroimidazole (7) (EC50 = 0.03 mu M) proved 5 times more active than compound 4. Docking experiments showed that the introduction of a chiral center would not affect the binding of both (R)-7 and (S)-7. The internal scoring function of the Autodock program calculated the same inhibition constant (K-i = 7.9 nM) for the two enantiomers. Compounds 7 (ID50 = 8.25 mu M) were found more active than efavirenz (ID50 = 25 mu M) against the viral RT carrying the K103N mutation, suggesting for these compounds a potential use in efavirenz based anti-AIDS regimens.