Novel 2-chloro-8-arylthiomethyldipyridodiazepinone derivatives with activity against HIV-1 reverse transcriptase

Based on the molecular modeling analysis against Y181C HIV-1 RT, dipyridodiazepinone derivatives containing an unsubstituted lactam nitrogen and 2-chloro-8-arylthiomethyl were synthesized via an efficient route. Some of them were evaluated for their antiviral activity against HIV-1 RT subtype E and were found to exhibit virustatic activity comparable to some clinically used therapeutic agents.     

Synthesis of 2-aminopentafluoro-1,4-naphthoquinone derivatives

Potential biologically active derivatives of 2-aminopentafluoro-1,4-naphthoquinone modified at the amino group were synthesized in 32–96% yield by reactions of hexafluoro-1,4-naphthoquinone with nitrogen-centered nucleophiles.     

Synthesis and spectral properties of 1,4-naphthoquinone sulfanyl derivatives

Reactions of 2,3-dichloro-1,4-naphthoquinone with hexadecanethiol and other alkanethiols in ethanol in the presence of sodium carbonate afforded new symmetric and unsymmetrical sulfanylnaphthoquinone dyes.     

Synthesis and properties of fused tetracyclic derivatives of 1,4-naphthoquinone thioglycosides

A series of 1,4-naphthoquinone O-acetylthioglycosides have been synthesized by the condensation of fully O-acetylated derivatives of 1-thio-d-xylose, 1-thio-L-arabinose, 1-thio-d-galactose, 1-thio-d-mannose, and 1-thiomaltose with 3-chloro-2-methoxy-1,4-naphtho-quinone. Their deacetylation with MeONa/MeOH proceeded with simultaneous heterocyclization to yield linear carbohydrate-containing tetracyclic quinones. Tetracycles with trans junction of the carbohydrate and quinone rings are poorly soluble in water and organic solvents.     

HIV-1逆转录酶抑制剂的三维定量构效关系

采用比较分子力场分析法(CoMFA)和比较分子相似性指数分析法(CoMSIA)对一系列非核苷类HIV-1逆转录酶抑制剂(苯磺酰基亚胺噻唑类化合物)进行了三维定量构效关系的研究,获得了高可靠性的CoMFA和CoMSIA模型,其交叉验证相关系数q2值分别为0.748和0.607.通过对CoMFA和CoMSIA模型三维等势图的分析,确定了该类化合物抗HIV-1活性的结构要求.研究结果表明,对苯磺酰基亚胺噻唑类化合物而言,在苯环的C-5位引入体积大和电负性强的基团能增加其抑制活性;苯环的C-2位的氢键给体基团对活性有利;噻唑环的R2取代基疏水性增大会降低生物活性.研究结果表明,可以指导新HIV-1逆转录酶抑制剂的设计和合成.     

Electronic transitions in 1,4-naphthoquinone derivatives

Single electronic transitions in 1,4-naphthoquinone and seven of its derivatives substituted in the quinoid system have been theoretically studied semi-empirical SCF MO CI calculations, in the frame of π and all valence electron (AVE) approximations. Dipole electrostatic contributions to the shifts originating from the solvent have been calculated and the local nature of the most significant transitions has been analyzed. The results agree satisfactorily with experiment, showing the effects of the substituents, which in some cases are underestimated.     

Synthesis and HIV-1 integrase inhibition activity of some N-arylindoles

Eight simple N-arylindoles were designed, synthesized and evaluated as human immunodeficiency virus (HIV)-1 integrase inhibitors in vitro for the first time. Among these compounds, 3b, 3e and 3g demonstrated significant anti-HIV-1 integrase activity. Especially 3b showed the highest anti-HIV-1 integrase activity with EC50 value of 7.88 microg/ml and TI value of 24.61. Meantime, some structure-activity relationships were also observed and will provide a new lead for design and discovery of more potent N-arylindoles as HIV-1 integrase inhibitors.     

Syntheses of new difluoromethylene benzoxazole and 1,2,4-oxadiazole derivatives, as potent non-nucleoside HIV-1 reverse transcriptase inhibitors

In an effort to prepare new fluorine-containing compounds, which are active against HIV, several chemical modifications of a series of benzoxazole and 1,2,4-oxadiazole-CF₂CHOHAr derivatives were carried out. The products (9-30) which all have one or two CF₂ groups were tested for activity against HIV-1; they were devoid of significant activity, one of them being cytotoxic.     

Synthesis of water-soluble N-Acetyl-L-cysteine conjugates of naphtazarin (5,8-Dihydroxy-1,4-naphthoquinone) derivatives

Base-catalytic condensation of N-acetyl-L-cysteine with substituted naphthazarins was first obtained a series of mono-, di-, tri- and tetra-substituted S-aminoacid naphthazarin conjugates bearing alkyl (hydroxy) groups. It was shown that three- and tetra-N-acetyl-L-cysteine naphthazarin derivatives are readily soluble in water.     

Synthesis of 2-alkoxy 1,4-naphthoquinone derivatives as antiplatelet,antiinflammatory, and antiallergic agents

In our continuing search for novel antiplatelet, antiallergic, and antiinflammatory agents, 2-alkoxy derivatives of 1,4-naphthoquinone were prepared. Some of these compounds showed significant antiplatelet, antiallergic, and antiinflammatory activities. Among them, 2-propoxy-1,4-naphthoquinone and 2-butoxy-1,4-naphthoquinone exhibited potent inhibitory effect on neutrophil superoxide anion formation. These two compounds are worthy of further exploration.     

Cyclocondensation of 5-ethynyl-1,4-naphthoquinone derivatives with hydrazine

Condensation of 5-arylethynyl-3-diethylaminonaphthoquinones with NH₂NH₂ afford 3-benzyl-9-diethylaminobenzo[de]cinnolin-7-ones. The substituents in the phenyl ring have a pronounced effect on the reaction time and the yields of benzocinnolinones and by-products. The replacement of the arylethynyl substituent in the starting naphthoquinone by the 3-hydroxyalk-1-ynyl group leads to a change in the direction of cyclization resulting in substituted naphtho[1,8-cd]-1,2-diazepin-8-ones as condensation products.