Davis–Beirut Reaction: Route to Thiazolo-, Thiazino-, and Thiazepino-2H-indazoles
摘要:
Methods for the construction of thiazolo-, thiazino-, and thiazepino-2H-indazoles from o-nitrobenzaldehydes or o-nitrobenzyl bromides and S-trityl-protected 1 degrees-aminothioalkanes are reported. The process consists of formation of the requisite N-(2-nitrobenzyl) (tritylthio)alkylamine, subsequent deprotection of the trityl moiety with TFA, and immediate treatment with aq. KOH in methanol under Davis-Beirut reaction conditions to deliver the target thiazolo-, thiazino-, or thiazepino-2H-indazole in good overall yield. Subsequent S-oxidation gives the corresponding sulfone.
Davis–Beirut Reaction: Route to Thiazolo-, Thiazino-, and Thiazepino-2H-indazoles
摘要:
Methods for the construction of thiazolo-, thiazino-, and thiazepino-2H-indazoles from o-nitrobenzaldehydes or o-nitrobenzyl bromides and S-trityl-protected 1 degrees-aminothioalkanes are reported. The process consists of formation of the requisite N-(2-nitrobenzyl) (tritylthio)alkylamine, subsequent deprotection of the trityl moiety with TFA, and immediate treatment with aq. KOH in methanol under Davis-Beirut reaction conditions to deliver the target thiazolo-, thiazino-, or thiazepino-2H-indazole in good overall yield. Subsequent S-oxidation gives the corresponding sulfone.
Inhibition of myeloperoxidase: Evaluation of 2H-indazoles and 1H-indazolones
作者:Aaron Roth、Sean Ott、Kelli M. Farber、Teresa A. Palazzo、Wayne E. Conrad、Makhluf J. Haddadin、Dean J. Tantillo、Carroll E. Cross、Jason P. Eiserich、Mark J. Kurth
DOI:10.1016/j.bmc.2014.09.044
日期:2014.11
Myeloperoxidase (MPO) produces hypohalous acids as a key component of the innate immune response; however, release of these acids extracellularly results in inflammatory cell and tissue damage. The twostep, one-pot Davis-Beirut reaction was used to synthesize a library of 2H-indazoles and 1H-indazolones as putative inhibitors of MPO. A structure-activity relationship study was undertaken wherein compounds were evaluated utilizing taurine-chloramine and MPO-mediated H2O2 consumption assays. Docking studies as well as toxicophore and Lipinski analyses were performed. Fourteen compounds were found to be potent inhibitors with IC50 values < 1 mu M, suggesting these compounds could be considered as potential modulators of pro-oxidative tissue injury pertubated by the inflammatory MPO/H2O2/HOCl/HOBr system. (C) 2014 Elsevier Ltd. All rights reserved.
Davis–Beirut Reaction: Route to Thiazolo-, Thiazino-, and Thiazepino-2<i>H</i>-indazoles
作者:Kelli M. Farber、Makhluf J. Haddadin、Mark J. Kurth
DOI:10.1021/jo501014e
日期:2014.8.1
Methods for the construction of thiazolo-, thiazino-, and thiazepino-2H-indazoles from o-nitrobenzaldehydes or o-nitrobenzyl bromides and S-trityl-protected 1 degrees-aminothioalkanes are reported. The process consists of formation of the requisite N-(2-nitrobenzyl) (tritylthio)alkylamine, subsequent deprotection of the trityl moiety with TFA, and immediate treatment with aq. KOH in methanol under Davis-Beirut reaction conditions to deliver the target thiazolo-, thiazino-, or thiazepino-2H-indazole in good overall yield. Subsequent S-oxidation gives the corresponding sulfone.