1-取代苯基-1,4-二氢-6-甲基-4-哒嗪酮-3-酰氨基硫脲的合成及其抗烟草花叶病毒活性

用1－芳基－1，4－二氢－6－甲基－4－氧哒嗪－3－酰肼与取代苯基异硫氰酸酯反应合成了系列新型取代－1，4－二氢－6－甲基－4－哒嗪酮－3－酰氨基硫脲化合物，其结构经IR，1H NMR及元素分析确认，生物活性测定表明，该类化合物对烟草花叶病毒具有很高的抑制活性。     

4-氟-1,2-二氢-3,6-哒嗪二酮及其衍生物的合成

本文报导了4-氟-1,2-二氢-3,6-哒嗪二酮(Ⅱ)及其衍生物3,6-二氯-4-氟哒嗪(Ⅲ)、3-甲氧基-4-氟-6-氯哒嗪(Ⅳ)、3-邻甲苯氧基-4-氟-6-氯哒嗪(Ⅵ)、1-苯基-3-羟基-4-氟-6-哒嗪酮(Ⅶ)等五种新化合物的合成,探讨了(Ⅲ)同亲核试剂的反应性能和部分化合物的药理实验结果.     

3-甲氧基-6-(4-烷氧苯基)哒嗪的合成及介晶性研究

在三苯基膦钯的催化下，由3－氯－3－甲氧基哒嗪与对烷氧苯基硼酸偶联合成了7种具有液晶性的中心桥连基为哒嗪环，不同烷氧基长度的含有苯环的哒嗪衍生物，并通过DSC和偏光显微镜对其介晶性进行了表征。研究表明，末端链长度对相变温度和清亮点温度均有影响，但对相变温度的影响较小。     

2,5-二(对硝基苯基)-1,3,4-噻二唑的合成

通过对硝基苯甲酰氯与肼反应合成了对硝基苯甲二酰肼，后者与P2S5缩合反应合成了2，5－二对硝基苯基－1，3，4－噻二唑。研究了合成反应条件，使用吡啶作溶剂，收率76．2％。经元素分析，IR，^1H NMR和MS确证了产物的结构。生物活性初步研究表明，该化合物具有一定的杀菌活性。     

3-芳烷氨基-6-氯哒嗪的合成及其除草活性

通过3,6-二氯哒嗪与(未)取代芳烷基胺在DMF/NaH或正丁醇体系缩合, 合成了13个3-芳甲(乙)氨基-6-氯哒嗪类化合物, 其中11个为新化合物, 它们的结构均经¹H NMR, IR和元素分析确证. 初步的生物活性测试结果表明, 所合成的化合物对阔叶杂草有一定的抑制作用, 如化合物4f在施药量为10 µg•mL^－1时对油菜的抑制率是76.42%. 讨论了其结构与除草活性的关系.     

微波辐射快速合成2-(2′-羟苯基)-5(6)取代苯并咪唑衍生物

苯并咪唑衍生物具有一定的抗病毒能力[1 ] ,一些苯并咪唑衍生物已用作农用抗植物病毒剂[2 ] 。一锅煮合成反应时间较长 ,产率中等[3,4] 。本文用取代邻苯二胺和水杨酸为原料 ,吡啶为溶剂 ,ＰＯＣｌ3为催化剂 ,微波辐射法合成了标题化合物。合成路线如下 :1　实验部分1 1　仪器ＷＣ 1型熔点测定仪 (温度计未校正 ) ;日本岛津ＩＲ 435红外光谱仪 (ＫＢｒ压片 ) ;ＴＥＯＬ ＦＸ90Ｑ核磁共振仪 ,ＤＭＳＯ ｄ6 为溶剂 ;日本柳公Ｃ·Ｈ·Ｎ元素分析仪ＭＴ 3;苏州三星电子有限公司产新天地Ｍ9Ｋ88型微波炉 ,输出功率 85 0Ｗ ,2 4 5 0Ｈｚ。1 2　…     

3-芳氧基-6-(3,5-二甲基-1H-吡唑-1-基)哒嗪的合成及生物活性

为了寻找高活性的先导化合物, 以3,6-二氯哒嗪为原料, 经过三步反应, 合成了一系列未经文献报道的3-芳氧 基-6-(3,5-二甲基-1H-吡唑-1-基)哒嗪. 所有新化合物的结构均经过¹H NMR, IR, LC-MS和元素分析确认. 初步的生物活性测试表明, 所合成的化合物都有一定的除草活性.     

3-烷氧基-6-（4-甲氧羰基苯基）哒嗪的合成及介晶性研究

3，6-二氯哒嗪和醇在相转移催化剂(C_4H_9)_4NBr和浓碱作用下，合成3-氯- 6-烷氧基哒嗪，在三苯基膦钯的催化下，用3-氯-6-烷氧基哒嗪与对甲氧羰基苯基 硼酸偶联，并以较好产率合成了八种中心桥连基为哒嗪环，含有苯环、酯基、不同 长度烷氧基的哒嗪衍生物，并通过差示扫描量热法（DSC）对其介晶性进行了表征 ，同时发现其中七种都具有介晶性。研究表明，末端链长度对相变温度和清亮点温 度均有影响。     

1-甲基-3-芳基-6-三氟甲基哒嗪-4-酮类化合物的合成与生物活性

在现有原卟啉原氧化酶抑制剂构效关系基础上,设计了一类结构新颖的3-芳基哒嗪酮类化合物,并探索了该类化合物的合成方法,合成了9个3-芳基哒嗪酮类化合物,并用于开展室内除草活性测定和作物安全性评价.结果表明3-芳基哒嗪酮类化合物具有较高的芽前、芽后除草活性和作物安全性.对高活性化合物3-[2,4-二氯-5-(环戊氧基)苯基]-1-甲基-6-(三氟甲基)哒嗪-4(1H)-酮(Ie)进行了苗后玉米田间小区药效验证试验,结果表明化合物Ie在60 g a.i./hm2剂量下的总草防效略高于105 g a.i./ha用量的硝磺草酮,且对苗后玉米安全.     

3-(未)取代苄氧基-6-氟哒嗪的合成及其除草活性

通过3,6-二氟哒嗪与(未)取代苄醇在NaOH/CH₃CN体系反应, 合成了一系列未见报道的3-(未)取代苄氧基-6-氟哒嗪, 其结构均经¹H NMR, IR和元素分析确证. 初步的生物活性测试结果表明, 所合成的化合物对油菜和稗草均有一定的抑制作用, 讨论了其结构与除草活性的关系.     

二氧化碳和丙烯直接合成甲基丙烯酸的NiPMo/TiO2催化剂的研究

用溶胶-凝胶法以磷钼酸(MPA)的镍盐溶液水解钛酸四丁酯制备了NiPMo/TiO2催化剂.使用ICP、 XRD、 TG-DTA、 IR、 TPD-MS和微反应技术研究了催化剂的化学组成、热稳定性、化学吸附性质和催化反应性能.杂多钼酸盐与TiO2通过O2-在TiO2表面发生了键合.在623 K下,杂多阴离子仍保持原有的Keggin结构.CO2在Lewis酸位Ni(Ⅱ)和Lewis碱位Ni-O-Mo的桥氧协同作用下生成CO2卧式吸附态Ni(Ⅱ)←O-(CO)←(O--Ni).丙烯有多种吸附态在催化剂上吸附.在563 K、 1 MPa和空速1500 h-1的反应条件下,丙烯的摩尔转化率为3.2%,产物MAA选择性为95%.     

Toward new camptothecins. Part 6: Synthesis of crucial ketones and their use in Friedländer reaction

In the context of the preparation of camptothecin and luotonin A analogs, the synthesis of some key keto-precursors and their use in Friedländer condensation are described. This paper also focuses on the stability of these keto intermediates and emphasizes the major differences between indolizinones and pyrroloquinazolinones series. Noteworthy is also the report of some original structures isolated as by-products of some experiments.     

CoFe2O4自形成磁性液体场致结构化对磁化的影响

The Langevin paramagnetic theory can’t describe the relation between magnetization of ferrofluids and applied magnetic field. The structuralization of ferrofluids, which is considered the main influence factor of the magnetization, is regarded. The part of magnetization works is deposited when the structure is forming. This action influences the magnetization of ferrofluids directly or indirectly. On the base of the “compressing” model, the Langevin function that usually describes the magnetization of ferrofluid is modified, and a well-fitted curve is obtained. An equation of the relation between the equivalent volume fraction after being “compressed” and the intensity of magnetic field is discovered, which approximately describes the process of magnetization. The relation between the approximate initial susceptibility and the volume fraction can be obtained from modified formula.     

Highly regioselective Buchwald–Hartwig amination at C-2 of 2,4-dichloropyridine enabling a novel approach to 2,4-bisanilinopyridine (BAPyd) libraries

The highly regioselective Buchwald–Hartwig amination at C-2 of the cheap and readily accessible reagent, 2,4-dichloropyridine with a range of anilines and heterocyclic amines is described. This new methodology is robust and provides a facile access to 4-chloro-N-phenylpyridin-2-amines on 0.25 mol scale. These intermediates undergo a further Buchwald–Hartwig amination at higher temperature to enable rapid exploration of the chemical space at C-4 and to provide a library of 2,4-bisaminopyridines.     

KMnO4-mediated oxidative CN bond cleavage of tertiary amines: Synthesis of amides and sulfonamides

KMnO₄-mediated oxidative CN bond cleavage of tertiary amines producing secondary amine was introduced, which was trapped by electrophiles (acyl chloride and sulfonyl chloride) to form amides and sulfonamides. The reaction could take place at mild condition, tolerating a wide range of function groups and affording products in moderate to excellent yields.     

Chemistry of heterocyclic compounds at the A. E. Favorsky Irkutsk Institute of Chemistry, Siberian Branch of the Russian Academy of Sciences, over 50 years (Review)

The review contains a concise historical account and information on the most significant researches undertaken by the staff at the A. E. Favorsky Irkutsk Institute of Chemistry, Siberian Branch of the Russian Academy of Sciences on the Chemistry of Heterocyclic Compounds. Dedicated to Academician of the Russian Academy of Sciences B. A. Trofimov on his 70th jubilee. Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 10, pp. 1443–1502, October, 2008.     

Sulfur-directed metal-free and regiospecific methyl C(sp3)–H imidation of thioanisoles

Regiospecific and direct imidation of the methyl C(sp³)–H bond of thioanisoles is realized under mild and metal-free conditions with N-fluorobis(benzenesulfonyl)imide as an oxidant and nitrogen source. Proposed mechanism suggests that thionium ion intermediates and a Pummerer-type reaction are involved. The imidation has advantages such as high step-economy, excellent functionality tolerance, and regiospecificity, giving structurally diverse imidation products.     

Selective syntheses of 2H-1,3-oxazines and 1H-pyrrol-3(2H)-ones via temperature-dependent Rh(II)-carbenoid-mediated 2H-azirine-ring expansion

The Rh(II)-catalyzed reaction of 2-carbonyl-substituted 2H-azirines with ethyl 2-cyano-2-diazoacetate or 2-diazo-3,3,3-trifluoropropionate provides an easy access to 2H-1,3-oxazines and 1H-pyrrol-3(2H)-ones. These compounds can be selectively prepared from the same starting material using temperature as the only varied parameter. The 2-azabuta-1,3-diene intermediate, a common precursor for both heterocyclic products, isomerizes into 2H-1,3-oxazine under kinetic control, while 1H-pyrrol-3(2H)-one is the sole product of the reaction at elevated temperatures. According to DFT-calculations a one-atom oxazine ring contraction involving ring-opening to a 2-azabuta-1,3-diene intermediate, followed by a 1,5- and 1,2-prototropic shift leads to the consecutive formation of imidoylketene and azomethine ylide, which then further undergo cyclization to the pyrrole derivative.     

Synthesis of 1-benzyloxypyrazin-2(1H)-one derivatives

Different approaches for the synthesis of 1-benzyloxypyrazin-2(1H)-one derivatives from simple amino acids have been investigated. A library of 33 precursors for the preparation of N-hydroxy pyrazinones was obtained in moderate to good yields.