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In an effort to develop new and more effective therapies to treat tuberculosis, a series of benzothiadiazine 1,1-dioxide derivatives were synthesized and their in vitro activity against Mycobacterium tuberculosis, Mycobacterium avium and Mycobacterium intracellulare was evaluated. One of the compounds, 8c, exhibited potent anti-tubercular activity, particularly for the resistant strains and thus prompted us to investigate its in vivo profile. However, the in vivo testing in a mouse model of tuberculosis infection did not show significant anti-tubercular activity, probably because of its poor bioavailability.

A series of novel (un)substituted benzotriazolyl oxazolidinone derivatives has been synthesized and tested for in vitro antibacterial activities by MIC determination against a panel of susceptible and resistant Gram-positive and Gram-negative microorganisms, some of which are resistant to methicillin and vancomycin. Compounds 20, 21, 24, 29 and 30 from this series were found to be equipotent or more potent than linezolid in vitro.

A new series of antituberculosis agents 6-9 was designed, synthesized and evaluated for antituberculosis activity against Mycobacterium tuberculosis H37Rv and clinical isolates in an agar dilution method. Compound 9h showed comparable in vitro activity (MIC) to isoniazid against M. tuberculosis H37Rv and clinical isolates (sensitive strains) and superior activity against resistant strains of M. tuberculosis.

Several disubstituted- and deoxydisubstituted- derivatives of α-D-xylofuranose have been synthesized and evaluated on various in vitro human cancer cell lines. In primary in vitro screening, seven derivatives expressed anticancer activity.

In an effort to find potent antifungal agents, a variety of triazole derivatives with a 5-substituted tetrazole structure 6, 7, 12 and 14 were prepared and evaluated for antifungal activity against Candida spp., Cryptococcus neoformans, and Aspergillus spp. in vitro. The location of the methyl group at the C-3 of compounds 12 and 14 has been demonstrated to be a key structural element of antifungal potency.

Upon condensation with 4-isothiocyanato-4-methyl-2-pentanone, 2,3-diaminonaphthalene and N-aminoethyladenosine gave in good yields substituted pyrimidonaphthoimidazole and imidazopyrimidine thione. Refluxing pyrimidobenzthiazole with methanol H2SO4 at pH∼1 resulted in S-methyl pyrimidobenzthiazole in moderate yield. Pyrimidobenzimidazole derivatives could be reacted to S-alkylated and N-acylated derivatives by refluxing with ethyl bromoacetate in the presence of anhydrous potassium carbonate in THF and by heating in an acetic acid/acetic anhydride mixture. Heating of pyrimidobenzimidazole with 75% aqueous H2SO4 on a water bath ended up in a rearranged product. All compounds gave correct 1H NMR, IR, and HR mass spectra. Results of antiinflammatory, analgesic, and anticancer activity screening of the new compounds are described.

Synthesis and antitumor activity of goniofufurone analogues 15, 16, 17, 33, and 46 is reported. Key step in the synthesis is Pd (II) mediated oxidative cyclisation of vinyl-(hydroxy) furans 18, 19 to the corresponding lactols 32, 43. Cytotoxicities of 15, 16, 17, 33, and 46 tested against six human cancer cell lines are reported. Change of stereochemistry at C-5, C-6 and C-7 position of goniofufurone (1) did not enhance the cytotoxicities significantly.

A series of novel 2,5-bis(guanidino-aryl)-1-methyl-1H-pyrroles 9a-h has been synthesized starting from 1-methyl-1H-pyrrole. The antifungal activities of compounds were evaluated by in vitro agar diffusion and broth dilution assay against Candida spp. and Aspergillus spp. Compound 9c from this series was found to be equipotent or more potent than fluconazole, whereas compound 9d was comparable to fluconazole against most of the tested strains.

In continuation of our research program for new antituberculosis drugs, we have designed, synthesized and evaluated antimycobacterial activity of new series of 1-[3-(4-benzotriazol-1/2-yl-3-fluoro-phenyl)-2-oxo-oxazolidin-5-ylmethyl]-3-substituted-thiourea derivatives against different Mycobacterium species i.e. M. tuberculosis, M. avium and M. intracellulare in an agar dilution method. Compound 17 exhibited excellent antimycobacterial activity (in vitro) against drug sensitive and resistant clinical isolates of M. tuberculosis. Its MIC value is equivalent to linezolid and superior to isoniazid against all these strains.

A series of (2R,3S)-2-(2,4-difluorophenyl)-3-(5-[2-[4-aryl-piperazin-1-yl]-ethyl]-tetrazol-2-yl)-1-[1,2,4]-triazol-1-yl-butan-2-ol (11a-n) and (2R,3S)-2-(2,4-difluorophenyl)-3-(5-[2-[4-aryl-piperazin-1-yl]-ethyl]-tetrazole-1-yl)-1-[1,2,4]-triazol-1-yl-butan-2-ol (12a-n) has been synthesized. The antifungal activity of compounds was evaluated by in vitro agar diffusion and broth dilution assay. Compounds 11d and its positional isomer 12d having 3-trifluoromethyl substitution on the phenyl ring of piperazine demonstrated significant antifungal activity against variety of fungal cultures (Candida spp. C. neoformans and Aspergillus spp.). The compound 12d showed MIC value of 0.12 microg/mL for C. albicans, C. albicans V-01-191A-261 (resistant strain); 0.25 microg/mL for C. tropicalis, C. parapsilosis ATCC 22019 and C. krusei and MIC value of 0.5 microg/mL for C. glabrata, C. krusei ATCC 6258, which is comparable to itraconazole and better than fluconazole. Further, compound 11d showed significant activity (MIC; 0.25-0.5 microg/mL) against Candida spp. and strong anticryptococcal activity (MIC; 0.25 microg/mL) against C. neoformans.

α-Hydroxylation of a ketone using o-iodosylbenzoic acid: α-hydroxyacetophenone via the α-hydroxy dimethylacetal reactant: Anhydrous methanol (80 mL) product: α-Hydroxyacetophenone. intermediate: 6.0 g (0.33 mol) of α-hydroxy dimethylacetal Keywords: acetal (and thioacetal) formation; hydrolysis, acetals and ketals; hydroxylation; oxidation, CH2 CHOH and CHOR; methanol

Activite ovicide du 2-phenyl-5-(1'-propynyl) thiophene, compose chimique present chez des Compositae Coreopis lanceolate et C. grandiflora. Cette activite est renforcee par un court traitement aux UV

Synthese du dithienylfuranne par oxydation de l'enolate de lithium de l'acetyl-2 thiophene avec CuCl 2 puis deshydratation de la di-[thienyl-2]-1,4 butanedione obtenue (A) avec Ac 2 O en presence d'HCl. L'α-terthiophene est obtenu par action de H 2 S/HCl sur A