λ<sup>3</sup>
-Iodanes as Visible Light Photocatalyst in Thioacetalization of Aldehydes
作者:Khokan Choudhuri、Milan Pramanik、Prasenjit Mal
DOI:10.1002/ejoc.201900753
日期:2019.8.15
Introducing iodine(III) reagent as visible‐light photo‐catalyst for the chemoselective thioacetalization of aldehydes. Mechanistically shown that the reactions proceeded via radical pathway upon light induced hemolytic cleavage of C–I bond of the catalyst.
Abstract A series of 1,4-dihydro-1,3,5-triazine derivatives were designed and synthesized and their antibacterial and antifungal activities were evaluated. Most of the synthesized compounds showed potent inhibition of several Gram-positive bacterial strains (including multidrug-resistant clinical isolates) and Gram-negative bacterial strains, with minimum inhibitory concentrations (MICs) in the range
摘要设计合成了一系列的1,4-二氢-1,3,5-三嗪衍生物,并对其抗菌和抗真菌活性进行了评价。大多数合成的化合物对几种革兰氏阳性细菌菌株(包括耐多药临床分离株)和革兰氏阴性细菌菌株均具有有效的抑制作用,其最低抑菌浓度(MIC)在2.1-181.2μmol/ L范围内。化合物7a和7c对革兰氏阳性菌(例如金黄色葡萄球菌4220),革兰氏阴性菌(例如大肠杆菌1924)和白色念珠菌7535表现出最强的抑制活性,MIC值为2.1或4.1μmol/ L. 尤其是,化合物7a最有效,对四种具有多重耐药性的革兰氏阳性细菌菌株的MIC为2.1μmol/ L。
A Convenient Synthesis of Some New 5-Substituted-4-Thioxo-Thiazolidinones and Fused Thiopyrano[2,3-<i>d</i>]thiazole Derivatives
作者:Nadia Hanafy Metwally
DOI:10.1080/10426500701849105
日期:2008.8.4
Z-5-arylmethylene-4-thioxo-thiazolidine derivatives have been synthesized by condensation of ω -(4-formylphenoxy)acetophenone derivatives with 4-thioxo-thiazolidine derivatives, in good yields. The cycloaddition of the newly synthesized compounds to N-arylmaleimides, N-phenyl-1,2,4-triazole-3,5-dione, ethyl acrylate and ω -nitrostyrene has been studied. Under thermal reaction conditions [4 + 2] cycloaddition proceeds
Synthesis and Characterization of 4-Phenacyloxy Benzaldehyde Derivatives
作者:Undri Rastuti、Dwi Siswanta、Jumina Jumina
DOI:10.13005/ojc/320515
日期:2016.10.25
Some new 4-phenacyloxy benzaldehydederivatives (PB1-PB4) have been synthesized through substitution reaction of 4-hydroxy-benzaldehyde derivatives and phenacyl bromide derivatives using triethylamine as the catalyst in the micellar media at room temperature. Physical data from IR, 1H-NMR, 13C-NMR and GC-MS were used to characterize the compounds structure. The yield of the PB1-PB4 compounds was 46-66%
Five series of (Z)-5-(4-(2-oxo-2-phenylethoxy)benzylidene)-2-thioxothiazolidin-4-one derivatives (I-V) were synthesized, characterized, and evaluated for their anti-bacterial activity. Most of the synthesized compounds showed potent inhibition against several Gram-positive bacteria (including multidrug-resistant clinical isolates) with MIC values in the range of 1-32 mu g/mL. Compounds IIIi, Vb and Vc presented the most potent activity, showing four-fold more potency than norfloxacin (MIC = 8 mu g/mL and 4 mu g/mL) and 64-fold more activity than oxacillin (MIC > 64 mu g/mL) against MRSA CCARM 3167 and 3506 strains with MIC values of 1 mu g/mL, and 64-fold more potency than norfloxacin (MIC > 64 mu g/mL) and comparable activity to oxacillin (MIC = 1 mu g/mL) against the QRSA CCARM 3505 and 3519 strains. None of the compounds exhibited any activity against the Gram-negative bacteria Escherichia coli 1356 at 64 mu g/mL. (C) 2012 Elsevier Masson SAS. All rights reserved.