溴代法合成硝基二苯醚类化合物

硝基二苯醚类化合物及其衍生物在农药、医药、杀菌及纺织品抗菌处理等领域有着广泛的应用。传统的合成非硝基苯环上含有取代基的二苯醚的方法，均为先合成含有相应取代基的苯酚，再与适当取代的邻或对硝基卤代苯醚化而得到目标物，对于非硝基环为三取代的化合物，其取代基均为2，4，6位。我们设想，先构筑硝基二苯醚母体，再通过硝基二苯醚的溴化反应，     

新型多甲氧基取代二苯醚类化合物的合成

以碘化亚铜为催化剂,Cs2CO3为碱,甲氧基取代苯酚(1)和甲氧基取代碘苯通过偶联反应形成C-O-C键,合成了27个新型的多甲氧基取代二苯醚类化合物,其结构经1H NMR和IR表征。最佳合成条件为:1 1.0mmol,CuI 0.10 mmol,Cs2CO32.0 mmol,DMF为溶剂,N2保护下于130℃下回流反应16 h。在最佳反应条件下,收率37%~94%。     

离子交换树脂催化合成羧酸酯的研究

本文选用南开牌D61、D72离子交换树脂催化多元醇和单羧酸的酯化反应,成功地合成了12种多元醇的单羧酸酯。在不同的反应条件下,酯的产率均超过90％。     

新型吡啶基吡唑酰胺类化合物的合成

以2,3-二氯吡啶为起始原料,经过肼解、与马来酸二乙酯成环、卤代、氧化和水解得到关键中间体吡啶基吡唑甲酸,然后与二氯亚砜反应生成甲酰氯,最后与各种环氨作用生成吡啶基吡唑甲酰胺类化合物。     

新型咪唑啉酮氧苯氧羧酸酯类化合物的合成及杀菌活性

新型咪唑啉酮氧苯氧羧酸酯类化合物的合成及杀菌活性     

溴代二羟基二苯醚类化合物的合成与抑菌活性研究

设计并合成了7个新的溴代2,2'-, 2,4-'和4,4'-二羟基二苯醚; 所有这些化合物的结构均经¹H NMR, MS, IR和元素分析所证实; 新化合物的结构避免了现有二苯醚杀菌剂在生产和使用过程中有可能生成高毒性二噁类化合物的缺点; 并选择8种有害菌对合成的新的溴代二羟基二苯醚进行了抑菌活性测试, 结果表明它们对所测试菌种具有很好的抑制活性, 与目前国内外广泛使用的广谱抗菌剂三氯新的抑菌活性相当.     

含磺酰胺的苯氧乙(丙)酸酯的合成与除草活性

磺酰脲(胺)作为一类抑制乙酰乳酸合成酶(ALS)活性的除草剂,具有剂量小,选择性强,杀草谱广,对哺乳动物毒性低,在环境中不易积聚等特点,成为除草剂研究的热点[1-4].本文采用"亚结构连接法",将含饱和杂环(芳环)磺酰胺引入到芳氧羧酸中,试图降低药物对作物产生的毒副作用与抗药性,同时提高其除草活性.8个目标化合物的合成路线如下:     

新型取代芳脲磺酰基苯氧丙酸酯的合成及除草活性

以α-对氯磺酰基苯氧基丙酸酯为原料,经氨化、甲酰化和胺解反应,合成了10个新型的取代芳脲磺酰基苯氧丙酸酯(4a~4 j),其结构经1H NMR,IR和元素分析确证。生测结果表明,4a~4 j均有一定的除草活性。     

N—芳基—4—取代苯基—氨基甲酸酯的合成及其除草活性

Ｎ┐芳基┐４┐取代苯基┐氨基甲酸酯的合成及其除草活性任康太＊戴广袖刘玉秀杨秀凤杨华铮（南开大学元素有机化学研究所天津３０００７１）关键词氨基甲酸酯，芳氧苯氧丙酸酯，合成，除草活性１９９６－０３－１１收稿，１９９６－０６－２６修回天津市２１世纪青年科学...     

取代均三氮杂苯氧基苯氧丙酸酯的合成及其除草活性

以三聚氯氰、二乙胺及2-(4-羟基苯氧基)丙酸酯为原料,经2步取代反应合成了2个新的取代均三氮杂苯氧基苯氧丙酸酯(4a和4b),其结构经1H NMR, IR和元素分析表征.生物活性测试结果表明,4对双子叶杂草苘麻有较好的除草活性.     

Synthesis and structure-insecticidal activity relationship of novel phenylpyrazole carboxylic acid derivatives containing fluorine moiety

A series of novel phenylpyrazole carboxylic acid derivatives containing fluorine moiety,i.e.,diamides 11,simple aryl-bearing amides 12 and acylthioureas 14 were successfully synthesized based on the key fluo ro-containing phe nylpyrazole acid intermediate.The new compounds were identified and confirmed by melting point,1H NMR,13C NMR and elemental analysis or HRMS.The bioassay results indicated that some of the compounds possessed excellent insecticidal activities towards oriental armyworm,diamondback moth and corn borer at low concentrations.For examples,compounds 11a,11e-g and 14b exhibited remarkable larvicidal activities with LC50 values of 0.13-0.39 mg/L and 0.0002-0.0014 mg/L against oriental armyworm and diamondback moth,respectively,were comparable with those of the control chlorantraniliprole.Particularly,lie were found superior to chlorantraniliprole in oriental armyworm tests(LC50:0.23 mg/L vs.0.26 mg/L);11a,lie,11f and 14c in diamondback moth tests with LC50 values of 0.0002 mg/L,0.0002 mg/L,0.0008 mg/L and 0.0005 mg/L,respectively,we re more effective than that of chlorantraniliprole.In addition,12 a also showed a promising insecticidal potential and development/optimization advantage.Compounds 11a,lle-g,12a,14b and 14c could be considered as possible new leading structures for further study.The SAR investigation indicated that the compounds with fluorine motif(e.g.,-F,-CF2H,-CF3)held apparently favorable insecticidal potentials,which provided useful guidance for further design/development of new phenylpyrazole-containing agrochemicals.     

Alkylation of carboxylic acid derivatives with dialkoxytitanacyclopropane reagents

Methods for the generation of dialkoxytitanacyclopropanes (dialkoxytitanium olefin complexes) are surveyed. Alkylation of carboxylic acid derivatives with these reagents giving rise to -titanio ketones and related species, which are spontaneously transformed into the corresponding cyclopropane compounds or react with external electrophiles, are considered.     

Synthesis of glycyrrhetic acid derivatives

11-Deoxyglycyrrhetinic acid (DGA) (2) was produced by Clemmensen reduction of the C-11 carbonyl of 18β-glycyrrhetic acid (GA) (1). Four derivatives of GA and DGA (3a–3d) were synthesized. Their structures were elucidated using spectral data (IR, mass, ¹H, ¹³C NMR). __________ Translated from Khimiya Prirodnykh Soedinenii, No. 2, pp. 153–155, March–April, 2008.     

Modelling the thermal behaviour of carboxylic acid derivatives with cylcodextrins in the solid-state

The application of classical QSAR and molecular modelling to the inclusion complexation of natural and modified cyclodextrins (CDs) with carboxylic acid derivatives as guest molecules was examined. Information was available on the thermal behaviour, in the solid-state of benzoic acid (BA), salicylic acid (SA), and various substituted aminosalicylic acids (3-aminosalicylic acid, 3-ASA, 4-aminosalicylic acid, 4-ASA and 5-aminosalicylic acid, 5-ASA), as well as on the thermal behaviour of 1:1 molar ratio physical and kneaded mixtures of these acids with each of three different cyclodextrins, β-, (BCD) 2-hydroxypropyl-β-, (HPBCD) and γ-cyclodextrin (GCD). The thermal behaviour of the binary (1:1 stoichiometry) mixtures was modelled using stepwise multiple regression (SMR). Two models for the prediction of the percentage mass loss and enthalpy of dehydration of the physical mixtures were established with correlation coefficients (r) of 0.79 and 0.92, respectively. Decreased correlation in the thermal behaviour of kneaded mixtures indicated significant interaction and possible formation of inclusion complexes. This revised version was published online in July 2006 with corrections to the Cover Date.     

Direct amidation of non-activated carboxylic acid and amine derivatives catalyzed by TiCp2Cl2

This paper described a mild and efficient direct amidation of non-activated carboxylic acid and amine derivatives catalyzed by TiCp₂Cl₂. Arylacetic acid derivatives reacted with different amines to afford the corresponding amides in good to excellent yield except of aniline. Aryl formic acids failed to react with aniline but smoothly reacted with aliphatic amines and benzylamine in moderate to good yield, fatty acids reacting with benzyl and aliphatic amines give amides in good to excellent yield. Chiral amino acids derivatives were transformed into amides without racemization in moderate yield. The possible mechanism of direct amidation catalyzed by TiCp₂Cl₂ was discussed. This catalytic method is very suitable for the amidation of low sterically hindered arylacetic acid, fatty acids with different low sterically hindered amines except aniline, as well as the amidation of aryl formic acid with benzyl and aliphatic amines.     

Synthesis of novel adamantoyl cellulose using differently activated carboxylic acid derivatives

New adamantane carboxylic acid esters of cellulose (adamantoylcelluloses) were synthesized homogeneously inN,N-dimethylacetamide/LiCl using differently activatedcarboxylic acid derivatives. This includes the reaction of cellulose with1-adamantoyl chloride and with adamantane-1-carboxylic acid after insitu activation with p-toluenesulfonyl chlorideand with 1,1-carbonyldiimidazole, which is a new and efficient tool. Thedegree of substitution (DS) has been determined by means of ¹H NMRspectroscopy using the perpropionylated adamantoyl cellulose samples. DS valuesas high as 2.1 were achieved. The reaction efficiency was 85% and the DS can becontrolled by the molar ratio and the reaction conditions applied. The reactionoccurs faster at the primary position compared to the secondary ones. Theproducts are soluble in various organic solvents dependent on the DS.Preliminary results of subsequent modifications and properties of theadamantoylcelluloses are discussed as well.     

羧基苯偶氮基杯[6]芳烃衍生物的合成及表征

近几年,随着对主客体化学研究的深入,杯芳烃的功能化修饰成为该领域的研究热点[1-6]。本文以邻、间、对氨基苯甲酸和杯[6]芳烃为原料,经重氮化 偶联反应合成了新型有色邻、间、对羧基苯偶氮基杯[6]芳烃,产物的结构经IR,1HNMR和元素分析表征;并研究了它们生色原理和光谱性能。结果表明它们是一类新型指示剂和具有新型配位空腔的主体分子。合成路线如下:图1　邻、间、对羧基苯偶氮基杯[6]芳烃的合成Fig.1　Fig1:Synthesisofp (o,m,p carboxylbenzeneazo)calix[6]arenes1　实验部分1 1　仪器与试剂Nicolet 460型傅里叶红外光谱仪(KBr…     

Docking-based CoMFA and CoMSIA study of azaindole carboxylic acid derivatives as promising HIV-1 integrase inhibitors

Three-dimensional quantitative structure–activity relationship (3D-QSAR) studies were performed based on a series of azaindole carboxylic acid derivatives that had previously been reported as promising HIV-1 integrase inhibitors. Docking studies to explore the binding mode were performed based on the highly active molecule 36. The best docked conformation of molecule 36 was used as template for alignment. The comparative molecular field analysis (CoMFA) model (including steric and electrostatic fields) yielded the cross validation q ² = 0.655, non-cross validation r ² = 0.989 and predictive r ² _pred = 0.979. The best comparative molecular similarity indices analysis (CoMSIA) model (including steric, electrostatic, hydrophobic and hydrogen-bond acceptor fields) yielded the cross validation q ² = 0.719, non-cross validation r ² = 0.992 and predictive r ² _pred = 0.953. A series of new azaindole carboxylic acid derivatives were designed and the HIV-1 integrase inhibitory activities of these designed compounds were predicted based on the CoMFA and CoMSIA models.     

Synthesis and In vitro Antitumor Screening of Novel 2,7‐Naphthyridine‐3‐carboxylic Acid Derivatives

New derivatives of 2,7‐naphthyridine‐3‐carboxylic acid were synthesized. We report the hydrolysis, chlorination, alkylation, and amination of the 2,7‐naphthyridine esters 1 , 2 . A series of Schiff's bases 8a , 8b , 8c , 8d , 8e , 8f , 8g , 8h , 8i , 8j , 9a , 9b , 9b' , 9c , 9d , 9e were produced by treating the obtained hydrazides 6 and 7 with aromatic aldehydes. The anticancer activities of the obtained derivatives were examined. Eighteen of the 24 newly synthesized compounds were qualified by the National Cancer Institute NCI (Bethesda, MD, USA) for in vitro screening against 60 different human tumor cell lines. The most active compound 8i was evaluated against a 60‐cell panel at five concentration levels and proved to be most sensitive towards central nervous system cancer (SF‐539), with GI₅₀ = 0.70 µmol, total growth inhibition = 5.41 µmol, and LC₅₀ = 53.7 µmol.     

Design,synthesis and herbicidal activities of novel self-dispreading phenoxy carboxylic acid derivatives for the control of water hyacinth floating on the water surface

A series of novel self-dispreading phenoxy carboxylic acid derivatives were designed and synthesized by I2 catalyzed one-step reaction. Their structures were confirmed by IR, NMR, and HRMS. The derivatives can self-spread and float on the water surface. Preliminary bioassays showed that some compounds, 3i–3p, had excellent herbicidal activities against water hyacinth. This strategy provided a novel approach for the water hyacinth control.