取代吲哚-3-甲醛与3-甲基-1-苯基-5-吡唑啉酮的固相缩合反应

在无溶剂、无催化剂、微波辐射条件下,取代吲哚-3-甲醛与3-甲基-1-苯基-5-吡哇啉酮通过固相Knoevenagel缩合反应合成了一系列4-(取代吲哚基-3-次甲基)-3-甲基-1-苯基-5-吡唑啉酮,产物结构经IR,1H NMR确证.最佳反应条件为:n(吲哚-3-甲醛):n(3-甲基-1-苯基-5-吡哇啉酮)＝1....     

1-(2-氰基)-苯基-3-甲基-5-吡唑啉酮的合成

邻氨基苯腈经重氮化、还原、酸析制得邻氰基苯肼盐酸盐.邻氰基苯肼盐酸盐经碱液中和,在乙醇溶液中与乙酰乙酸甲酯的醇溶液经亲核取代闭环成目标产物1-(2-氰基)-苯基-3-甲基-5-吡唑啉酮.对邻氰基苯肼盐酸盐和1-(2-氰基)-苯基-3-甲基-5-吡唑啉酮的合成工艺进行了改进,总收率约为79.4%     

几种新的吡唑啉衍生物的合成

以水杨醛、乙酰乙酸乙酯为原料合成3-乙酰基香豆素,3-乙酰基香豆素与各种取代基的苯甲醛反应生成相应的查尔酮,查尔酮再与2-肼基苯并噻唑反应合成了5种未见报道的吡唑啉,并通过核磁氢谱等对吡唑啉进行了表征。并对合成吡唑啉条件中的溶剂的选择以及温度的单因素实验,对合成条件进行了优化。     

3-羟基-7-氧代-5,6-二氢吡唑[3,4-e]并-1,2,4-三嗪的合成

以3-氨基-5-吡唑啉酮为原料,合成了3-羟基-7-氧代-5,6-二氢吡唑[3,4-e]并-1,2,4-三嗪,并对目标物及文献中未见报道的中间体如3-氨基-5-氧代-4-吡唑啉酮腙衍生物等,通过元素分析I、R1、HNMR和质谱分析确定了其结构。     

7-甲基-3-羟基吡唑[4,3-e]并-1,3,4-噁二嗪的合成

以3-甲基-5-吡唑啉酮为原料,合成了标题化合物,并对目标物及文献中未见报道的中间体如3-甲基-5-氧代-4-吡唑啉酮腙衍生物等,通过元素分析I、R1、HNMR和质谱分析确定了其结构。     

2-吲哚啉酮类化合物的合成及其体外活性研究

为开发新型多巴胺D4受体配基,以2-吲哚啉酮和1,4-二溴丁烷为原料,制得目标化合物1-(4-(4-(4-苯甲基)-1-哌嗪基)丁基)-2-吲哚啉酮、1-(4-(4-(4-氯苯甲基)-1-哌嗪基)丁基)-2-吲哚啉酮、1-(4-(4-(4-甲基苯甲基)-1-哌嗪基)丁基)-2-吲哚啉酮。通过体外受体结合分析,测定了这3个目标化合物对多巴胺D2、D3、D4.2受体的亲和性。实验结果表明:化合物1-(4-(4-(4-氯苯甲基)-1-哌嗪基)丁基)-2-吲哚啉酮对D4受体亲和选择性较大,其亲和常数(Ki)为0.5 nmol/L。     

新环7-甲基-5-苯基-3-氧代吡唑[4,3-e]并-1,3,4-(口恶)二嗪的合成

以3-甲基-1-苯基-5-吡唑啉酮为原料,合成了新环7-甲基-5-苯基-3-氧代吡唑[4,3-e]并-1,3,4-噁二嗪并对目标物及文献中未见报道的3-甲基-1-苯基-5-氧代-4-吡唑啉酮腙衍生物等,通过元素分析、IR、1HNMR和质谱分析确定了其结构。     

1-(4'-磺酸基苯基)-3-羧基-5-吡唑啉酮的合成及应用

1-(4'-磺酸基苯基)-3-羧基-5-吡唑啉酮是制备活性染料的重要中间体。本文对1-(4'-磺酸基苯基)-3-羧基-5-吡唑啉酮的合成路线及其优缺点进行了评述。指出2-乙酰基丁二酸二甲酯法是一种最有前景的合成方法。对1-(4'-磺酸基苯基)-3-羧基-5-吡唑啉酮应用进行了介绍。     

1,3-二亚氨基异吲哚啉合成工艺及应用研究进展

1?3-二亚氨基异吲哚啉是一种重要的有机合成中间体,在合成酞菁素颜料及异吲哚啉类颜料方面需求量大。综述了1?3-二亚氨基异吲哚啉的合成工艺,并对其应用研究进行了简要分析。     

吡唑啉酮衍生物的合成初探

以1-苯基-3-甲基-5-吡唑啉酮与苯甲酰氯进行的反应，探讨了合成高产率吡唑啉酮衍生物的简易方法。并通过TLC对产物进行了初步鉴定。     

Aluminum,Arsenic, Beryllium,Cadmium, Chromium,Cobalt, Copper,Iron, Lead,Mercury, Molybdenum,Nickel, Platinum,Thallium, Titanium,Vanadium, and Zinc: Molecular Aspects in Experimental Liver Injury

Experimental liver injury with hepatocelluar necrosis and abnormal liver tests is caused by exposure to heavy metals (HMs) like aluminum, arsenic, beryllium, cadmium, chromium, cobalt, copper, iron, lead, mercury, molybdenum, nickel, platinum, thallium, titanium, vanadium, and zinc. As pollutants, HMs disturb the ecosystem, and as these substances are toxic, they may affect the health of humans and animals. HMs are not biodegradable and may be deposited preferentially in the liver. The use of animal models can help identify molecular and mechanistic steps leading to the injury. HMs commonly initiate hepatocellular overproduction of ROS (reactive oxygen species) due to oxidative stress, resulting in covalent binding of radicals to macromolecular proteins or lipids existing in membranes of subcellular organelles. Liver injury is facilitated by iron via the Fenton reaction, providing ROS, and is triggered if protective antioxidant systems are exhausted. Ferroptosis syn pyroptosis was recently introduced as mechanistic concept in explanations of nickel (Ni) liver injury. NiCl₂ causes increased iron deposition in the liver, upregulation of cyclooxygenase 2 (COX-2) protein and mRNA expression levels, downregulation of glutathione eroxidase 4 (GPX4), ferritin heavy chain 1 (FTH1), nuclear receptor coactivator 4 (NCOA4) protein, and mRNA expression levels. Nickel may cause hepatic injury through mitochondrial damage and ferroptosis, defined as mechanism of iron-dependent cell death, similar to glutamate-induced excitotoxicity but likely distinct from apoptosis, necrosis, and autophagy. Under discussion were additional mechanistic concepts of hepatocellular uptake and biliary excretion of mercury in exposed animals. For instance, the organic anion transporter 3 (Oat3) and the multidrug resistance-associated protein 2 (Mrp2) were involved in the hepatic handling of mercury. Mercury treatment modified the expression of Mrp2 and Oat3 as assessed by immunoblotting, partially explaining its impaired biliary excretion. Concomitantly, a decrease in Oat3 abundance in the hepatocyte plasma membranes was observed that limits the hepatic uptake of mercury ions. Most importantly and shown for the first time in liver injury caused by HMs, titanium changed the diversity of gut microbiota and modified their metabolic functions, leading to increased generation of lipopolysaccharides (LPS). As endotoxins, LPS may trigger and perpetuate the liver injury at the level of gut-liver. In sum, mechanistic and molecular steps of experimental liver injury due to HM administration are complex, with ROS as the key promotional compound. However, additional concepts such as iron used in the Fenton reaction, ferroptosis, modification of transporter systems, and endotoxins derived from diversity of intestinal bacteria at the gut-liver level merit further consideration.     

THERMOPLASTIC,FLEXIBLE, AND RECYCLABLE COMPOSITES,DESIGN, PREPARATION,AND CHARACTERIZATION

Glass fiber reinforced composites based on thermosets are the traditional materials used for many applications due to their good mechanical properties. The non-recyclability of these materials has led to the necessity to develop thermoplastic composites and industrial processes for their manufacture [1]. The present paper deals with the preparation of thermoplastic pre-pregs unidirectionally reinforced with Twarn® and their mechanical characterization.     

DUO-ICP-AES测定精对苯二甲酸中的钴、铬、铁、锰、钼、镍、钛

采用DUO-ICP-AES同时测定精对苯二甲酸中钴、铬、铁、锰、钼、镍、钛,并对仪器的分析线选择、背景校正、入射功率、雾化器压力、辅助气流量、冷却气流量、蠕动泵转速的影响及共存元素的干扰、硝酸铯灰化助剂等因素进行了详细的研究。方法的检测限:钴0.0097 mg/L;铬0.0021 mg/L;铁0.0078 mg/L;锰0.0012 mg/L;钼0.0027 mg/L;镍0.016 mg/L;钛0.0027 mg/L,回收率和精密度分别为93.0%～99.5%和0.37%～3.2%。该方法快速简便,具有良好的精密度和准确度,适用于进出口精对苯二甲酸的日常检验。     

Pd-, Ni-, Fe-, and Co-Catalyzed Cross-Couplings Using Functionalized Zn-, Mg-, Fe-, and In-Organometallics

The development of new methods for preparing polyfunctional organometallics has made a broad range of such reagents available for various transition metal-catalyzed cross-couplings. An overview of the most general preparation methods will be presented. Applications to practical cross-coupling procedures will be covered, emphasizing the functional group compatibility and the reaction scope.     

Sylvatraxx树脂对半钢子午线轮胎胎面胶性能的影响

本文研究了Arizona Chemical公司生产的胎面增强助剂（Tread Enhancement Additive-TEA）Sylvatraxx 4401对半钢子午线轮胎胎面胶性能的影响。结果表明：Sylvatraxx 4401的加入有利于提高白炭黑的分散性,改善混炼胶的加工性能和硫化胶的物理机械性能,能够明显提高胎面的抗湿滑性。随着Sylvatraxx 4401用量的增加,白炭黑在胶料中的分散进一步提高,混炼胶的门尼粘度降低;硫化胶的压缩生热和阿克隆磨耗降低,0oC的tanδ明显提高的同时60oC的tanδ略微降低,有利于胎面胶抗湿滑性能的提高和滚动阻力、动态生热的降低。