Structure-activity dependency of new bacterial tryptophanyl tRNA synthetase inhibitors
摘要:
Analogues of the aminoacyl tRNA synthetase inhibitor, indolmycin, have been synthesised in which the side chain methyl group is replaced by a wide range of substituents. Their antibacterial and enzyme inhibitory potency is related to steric properties and conformational preferences. Copyright (C) 1996 Elsevier Science Ltd
C–H Alkenylation of Heteroarenes: Mechanism, Rate, and Selectivity Changes Enabled by Thioether Ligands
作者:Bradley J. Gorsline、Long Wang、Peng Ren、Brad P. Carrow
DOI:10.1021/jacs.7b03887
日期:2017.7.19
catalytic intermediate in these reactions may also account for unusual catalyst-controlled site selectivity wherein C–H alkenylation of five-atom heteroarenes can occur under electronic control with thioether ligands even when this necessarily involves reaction at a more hindered C–H bond. The thioether effect also enables short reaction times under mild conditions for many O-, S-, and N-heteroarenes (55 examples)
Regioselective preferential C H activation of sterically hindered 1,3-dienes over [4+2] cycloaddition
作者:Rakesh K. Saunthwal、Kapil Mohan Saini、Monika Patel、Akhilesh K. Verma
DOI:10.1016/j.tet.2017.03.028
日期:2017.4
Pd-catalyzed preferential CH activation of sterically hindered α, β-olefinic indoles onto alkenes beyond [4 + 2] cycloaddition has been described. The carbazole derivatives were readily synthesized via activation of vinylic CH bonds with excellent regioselectivity. Further, the one-pot strategy has been employed for the synthesis of tricyclic carbazoles. The double and triple CH activation followed by concomitant
Palladium-Catalyzed Intermolecular C3 Alkenylation of Indoles Using Oxygen as the Oxidant
作者:Wen-Liang Chen、Ya-Ru Gao、Shuai Mao、Yan-Lei Zhang、Yu-Fei Wang、Yong-Qiang Wang
DOI:10.1021/ol302840b
日期:2012.12.7
A general and efficient palladium-catalyzedintermolecular direct C3 alkenylation of indolesusingoxygen as the oxidant has been developed. The reaction is of complete regio- and stereoselectivity. All products are E-isomers at the C3-position, and no Z-isomers or 2-substituted product can be detected.
Syntheses and evaluation of the antioxidant activity of acitretin analogs with amide bond(s) in the polyene spacer
作者:Dimitra Hadjipavlou-Litina、George E. Magoulas、Marios Krokidis、Dionissios Papaioannou
DOI:10.1016/j.ejmech.2009.10.012
日期:2010.1
Ester analogs of the antipsoriatic drug acitretin were synthesized by coupling either anilines with N-protected indole-3-carboxylic acid, followed by deprotection and coupling with O-monoprotected dicarboxylic acids or Wittig reaction of indole-3-carboxaldehyde, 3-acetyl-1-tosylpyrrole and 4-amino-9-fluorenone with Ph3PCHCO2tBu, followed by N-deprotection, where necessary, and finally coupling with
通过将苯胺与N-保护的吲哚-3-羧酸偶联,然后脱保护并与O-单保护的二羧酸偶联或吲哚-3-甲醛,3-乙酰基-1的Wittig反应合成抗银屑病药物阿维A酸酯的酯类似物。 -甲苯磺酰基吡咯和4-氨基-9-芴酮与Ph 3 P CHCO 2 tBu,然后在必要时进行N-脱保护,最后与肉桂酰氟偶合。通过TFA介导的羧基脱保护得到相应的游离酸。虽然这些类似物和阿维A表现出非常低的还原能力,类似物5,6,8和12强烈抑制LOX带IC 50值范围从35–65μM。阿维A和它的类似物5 - 7,10,11和15抑制脂质过氧化的比更强烈水溶性维生素E而阿维A和模拟4是在体内更有效的抗发炎剂上诱导卡拉胶比吲哚美辛的大鼠爪水肿。
Palladium(II)/Polyoxometalate-Catalyzed Direct C-3 Alkenylation of Indoles using Dioxygen as the Terminal Oxidant
作者:Qiufeng Huang、Qianqian Song、Jin Cai、Xiaofeng Zhang、Shen Lin
DOI:10.1002/adsc.201201114
日期:2013.5.17
the direct CH olefination of indoles with alkenes. The transformation is catalyzed by palladium acetate combined with 12‐molybdophosphoric acid and uses oxygen as the terminal oxidant. 4‐Dimethylaminopyridine (DMAP) was observed to be an effective additive for the olefination reaction. Functional groups such as methoxy, benzyloxy, fluoro, bromo, ester, phenyl, and methyl were tolerated under the reaction