Redox-active benzimidazolium sulfonamides as cationic thiolating reagents for reductive cross-coupling of organic halides
作者:Weigang Zhang、Mengjun Huang、Zhenlei Zou、Zhengguang Wu、Shengyang Ni、Lingyu Kong、Youxuan Zheng、Yi Wang、Yi Pan
DOI:10.1039/d0sc06446g
日期:——
Redox-active benzimidazolium sulfonamides as thiolating reagents have been developed for reductive C–S bond coupling. The IMDN-SO2R reagent provides a bench-stable cationic precursor to generate a portfolio of highly active N–S intermediates, which can be successfully applied in cross-electrophilic coupling with various organic halides. The employment of an electrophilic sulfur source solved the problem
已开发出具有氧化还原活性的苯并咪唑磺酰胺作为硫醇化试剂用于还原 C-S 键偶联。IMDN-SO 2 R 试剂提供了一种稳定的阳离子前体,可生成一系列高活性 N-S 中间体,可成功应用于与各种有机卤化物的交叉亲电偶联。采用亲电硫源解决了催化剂失活问题,避免了硫醇的异味,具有条件实用、底物范围广、耐受性好等特点。
Structure–activity relationship of antileishmanials neolignan analogues
作者:Mário Aveniente、Eduardo F. Pinto、Lourivaldo S. Santos、Bartira Rossi-Bergmann、Lauro E.S. Barata
DOI:10.1016/j.bmc.2007.08.016
日期:2007.12
Twenty-two synthetic analogues of neolignans comprising beta-ketoethers and beta-ketosulfides were obtained from condensation reactions among beta-bromoketones and phenols or thiophenols, respectively, in basic solutions, and assayed in vitro for activity against intracellular Leishmania amazonensis and Leishmania donovani amastigotes, the causative agents of cutaneous and visceral leishmaniasis. The highest selective activity was found for compounds with sulfur bridges, whereas beta-ketosulphoxides and beta-ketosulphones had significantly less growth inhibitory activity. Compounds 2-[(4-chlorophenyl)thio]propan-1-one and 1-(3,4-dimethoxy)2-[(4-methylphenyl)thio]propan-1-one were the most potent, inhibiting the growth parasite species by over 90% at microgram/mL, but only compound 1-(3,4-dimethoxy)-2-[(4-methylphenyl)thio]propan-1-one was selectively toxic to the parasites. (C) 2007 Elsevier Ltd. All rights reserved.
EFFENBERGER, F.;RUSS, W., CHEM. BER., 1982, 115, N 12, 3719-3736