1,2-双[2-甲基-5-(3,4-二氟苯基)噻吩-3-基]全氟环戊烯的合成

在冰浴条件下, 2-甲基噻吩(1)与液溴反应生成3,5-二溴-2-甲基噻吩(2); 在－78 ℃条件下, 硼酸三丁酯加入2, 得到2-甲基-3-溴-5-硼酸基噻吩(3); 3,4-二氟溴苯与3反应得到2-甲基-3-溴-5-(3,4-二氟苯基)噻吩(4); 在－78 ℃下全氟环戊烯与4反应, 得到一种新的二芳基乙烯类光致变色化合物1,2-双[2-甲基-5-(3,4-二氟苯基)噻吩-3-基]全氟环戊烯(DT-1). 用IR, NMR, MS和元素分析确定了化合物DT-1的结构, 并对该化合物的光致变色特性进行了初步研究.     

三联噻吩-吡唑啉类化合物的合成

以2-溴噻吩为原料,经溴代反应和格氏试剂反应制得2,2':5',5'-三联噻吩(1);1乙酰化后与4-取代苯甲醛发生亲核加成反应得到α,β-不饱和酮(3a～3e);3与80%水合肼发生关环反应,合成了5个α-三联噻吩-毗唑啉类化合物(4a～4e),收率74.3%～89.7%.其结构经H NMR,IR和元素分析表征.3和4均为新化合物.     

2-噻吩乙酸的合成

以噻吩为原料,经乙酰基反应、氧化重排生成2-噻吩乙酸甲酯(2),2经水解得2-噻吩乙酸(3),总收率53．0％,其结构经IR和^1H NMR确证。     

α-溴-4-甲磺酰基苯乙酮的合成

以茴香硫醚为原料,经Friedel-Crafts、溴化和氧化3步反应合成了目标化合物,反应总收率在82％以上,中间体和产物的结构经IR,^1H NMR确证。     

6-溴-N-芳基噻吩[2,3-d]并嘧啶-4-胺类化合物的合成新方法

研究了6-溴-N-[3-氯-4-(3-氟苄氧基)苯基]噻吩[2,3-d]并嘧啶-4-胺的合成新方法.以相对廉价的2,5-二羟基-1,4-二噻烷和丙二腈为原料,依次通过Gewald反应、芳环溴代、缩合、环合以及Dimroth重排四步反应得到目标产物6-溴-N-[3-氯-4-(3-氟苄氧基)苯基]噻吩[2,3-d]并嘧啶-4-胺,总产率为56.9%.用1H NMR,IR,MS和HRMS对产物进行了结构表征.并应用该方法,合成了一系列的6-溴-N-芳基噻吩[2,3-d]并嘧啶-4-胺类化合物.研究表明该方法具有原料易得、操作简便、收率较高,且产物容易分离纯化等优点.     

麦芽酚及麦芽酚-3-O-β-D-葡萄糖甙的合成

以乙酰丙酮(1)为原料,经溴代、酯化反应得到3-苯甲酰氧基-2,4-戊二酮(2),2与甲酸乙酯缩合、脱水闭环、酯水解得麦芽酚(3),总收率50．4％。3与a一溴代四乙酰化葡萄糖(4)经糖甙化、脱乙酰基得麦芽酚-3-O-β-D-葡萄糖甙(5),收率60．8％,IR,^1H NMR和^13C NMR确证5的葡萄糖为β-构型。中间产物2无须纯化,可实现“一锅”反应合成3。     

新型2-苯并呋喃取代薁类衍生物的合成

以溴乙酰溴为酰化剂,对2-甲基薁进行酰基化反应,其酰化产物通过与水杨醛缩合,溴代反应及硫代乙酰胺的环化反应,以较好的收率,高选择性合成了新型的1-(2-苯并[6]呋喃酰基)薁和3-(2-苯并呋喃基)薁类[1,2-c]噻吩类衍生物,其结构经1H NMR,IR及元素分析表征.     

4,7-二噻吩-[2,1,3]苯并硒二唑的合成及其光电性能

苯并硫二唑经溴代,还原和闭环反应制得4,7-二溴[2,1,3]苯并硒二唑(3);以Pd(PPh3)2Cl2为催化剂,3与2-三丁基锡噻吩(4)经斯蒂尔偶联反应合成了4,7-二噻吩-[2,1,3]苯并硒二唑(5)。5为新化合物,其结构和性能经1H NMR,13C NMR,UV-Vis,荧光光谱法和循环伏安法表征。结果表明:5具有应用于光伏材料的带隙(12.2 e V);有较宽的吸收波长(260 nm~487 nm),在红光区域发射较强的荧光(620 nm);有可逆的氧化还原曲线,电化学性质稳定。     

meso-5,10,15,20-四（取代2-噻吩基）卟啉及其配合物的合成与表征

用混合溶剂法合成了中位噻吩基取代的卟啉化合物：meso-四(2-噻吩基)卟啉 ，meso-四(4-溴-2-噻吩基)卟啉和meso-四(3-甲基-2-噻吩基)卟啉，产率达到36． 5％-39．3％，考察了溶剂的配比、反应温度、反应时间等因素对反应的影响，其 最佳反应条件为：溶剂配比：丙酸：乙酸：硝基苯：2：2(or3)：1；反应温度： 130~140t；反应时间：50-60min．研究了利用固相合成法合成上述卟啉化合物与过 渡金属盐形成配合物的配位反应，在40℃利用固相合成法合成了卟啉化合物与 Fe2' Fe~3+，CO~2+，Ni~2+，Mn~2+等过渡金属离子形成的配合物，产率为81．1 ％~87．6％．利用元素分析，UV-vis，m，'HNMR， HRMS对卟啉化合物及其配合物 进行了表征，利用TG-DTA研究了它们的热稳定性，利用EPR研究了它们的顺磁性．     

4-溴吲哚-3-甲醛的合成

以2-甲基-3-硝基苯胺为原料,经重氮化反应先合成2-溴-6-硝基甲苯(1),1与N,N-二甲基甲酰胺二甲基缩醛经L-B吲哚合成法制得4-溴吲哚(3),3与N,N-二甲基甲酰胺和三氯氧磷起Vilsmeier-Hacck反应得4-溴吲哚-3-甲醛,总收率62．0％。其结构经^1H NMR和IR确证。     

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%.     

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.     

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.     

Copper catalyzed/mediated synthetic methodology for ebselen and related isoselenazolones

Scope of the copper catalyzed/mediated selenium-nitrogen coupling reaction has been studied for the synthesis of isoselenazolones. It is noticed that the 2-chloro, 2-bromo-, and 2-iodo-aryl amides substrates can be exploited in the selenium-nitrogen coupling reaction by employing 25-100 mol % of CuI/1,10-phenanthroline (L) and potassium carbonate as a base in DMF. Furthermore, electron rich 2-chloro-arylamides also underwent selenium-nitrogen coupling reaction to give biologically important selenium-nitrogen heterocycles. Also, copper-catalyzed selenium-nitrogen coupling reaction has been meticulously applied for the synthesis of diaryl diselenides having methoxy, amine, and amide functionality from respective aryl iodides in the presence of stoichiometric amount of succinimide as an external Se-N coupling partner.     

Knoevenagel condensation catalyzed by novel Nmm-based ionic liquids in water

A series of novel N-methyl morpholine (Nmm) based ionic liquids with 1,2-propanediol group were synthesized and used as catalysts for Knoevenagel condensation at room temperature in water. Under the effect of the catalyst, various aldehydes or aliphatic ketones could react with a wide range of activated methylene compounds well, including malononitrile, alkyl cyanoacetate, cyanoacetamide, β-diketone, barbituric acid, 2-arylacetonitrile and thiazolidinedione. Furthermore, most of the products could be separated just by filtrating and washing with water. Additionally, the catalyst is recyclable and applicable for the large-scale synthesis.     

Construction of polyheterocyclic spirotetrahydrothiophene derivatives via sulfa-Michael/aldol cascade reaction

A series of polyheterocyclic spirotetrahydrothiophene derivatives were obtained in moderate to excellent yields via a catalyst-free sulfa-Michael/aldol cascade reaction of chalcones 1 and commercially available 1,4-dithiane-2,5-diol 2 under mild conditions. We also present the first asymmetric sulfa-Michael/aldol cascade reaction of chalcones 1 and commercially available 1,4-dithiane-2,5-diol 2 with moderate to good enantioselectivities catalyzed by readily available chiral phase-transfer catalysts (PTCs).     

Suzuki-Miyaura reactions of the soluble guanylate cyclase inhibitor NS2028: a non-product specific route to C-8 substituted analogues

Both soluble guanylate cyclase (sGC) inhibitors ODQ 1 and NS2028 2 are synthesized via improved protocols. In the former case treating 3,4-dihydroquinoxalin-2(1H)-one oxime 8, which can be prepared in two steps from 1,2-benzenediamine, with 1,1′-carbonyldiimidazole (CDI) gives the dihydro-ODQ 10 that in the presence of KMnO₄ oxidises to give ODQ 1 in an overall yield of 46% starting from 1,2-benzenediamine. In the latter case, the synthesis affords NS2028 2 from 2-amino-4-bromophenol 3 in three steps with an overall yield of 85% and avoids the need for chromatography. Furthermore, Suzuki-Miyaura reaction conditions are described that enable the preparation of 8-aryl and 8-heteroaryl derivatives of NS2028 directly from NS2028 2. Finally, demethylation of the 8-(methoxyphenyl) substituted analogues afforded the 8-(hydroxyphenyl) derivatives 40-42. All new products are fully characterised.