肉桂酰基硫脲衍生物的合成及杀菌活性

肉桂酸;酰基硫脲;相转移催化;合成;生物活性     

α-萘乙酰硫脲和酰胺衍生物的合成及其抑制作物病菌活性

α-萘乙酸;酰基硫脲;酰胺;相转移催化;合成;抑菌活性     

超声辐射合成桂皮酰基硫脲嘧啶衍生物

n′-(二取代嘧啶基)-n-桂皮酰基硫脲;超声辐射;相转移催化;合成     

相转移催化法合成已二酰基二芳基双硫脲化合物

酰基硫脲类化合物具有广泛的生物活性,可用作杀虫剂、杀菌剂、抗病毒剂和植物生长调节剂等,但关于双酰基硫脲化合物的研究较少。根据活性子叠加原理,为了寻找高生物活性的新化合物,我们从已二酸出发,经酰化得到已二酰氯,然后以PEG-400为相转移催化剂,与硫氰酸铵作用后不经分离直接与芳胺反应,一锅法合成了9种新的已二酰基二芳基双硫脲化合物。其结构经元素分析、IR及^1HNMR确证。合成路线如下。     

超声波辐射下的固—液相转移催化法合成苯乙酰基芳基硫脲化合物

合成酸基硫减类化合物常用的方法是固一液相转移催化法“‘．因超声波辐射可以加快有机合成反应，提高产率，本文采用了超声波辐射与相转移催化相结合的方法，以聚乙二醇一400（PEG－400）为催化剂，二氯甲烷为溶剂，在常温下合成了10种N一苯乙酸基一N‘一芳基硫腺新化合物，产率大部分比相应的相转移催化法合成高．本法条件温和、操作简便、产率较高．仪器为CQ－250型超声波清洗器，频率33土2kHZ；PE1730FT－IR红外光谱仪，溪化钾压片；BRUKERAC七0核磁共振仪，CDCI。为溶剂，TMS为内标；PE－2400CHN元素分析仪．化合物（皿…     

相转移催化法合成N—2—苯基—1,2,3—三唑—4—甲酰基—N′—芳基硫脲

报道了２－苯基－１，２，３－三唑－４－甲酰氯和硫氰酸铵在ＰＥＧ－４００固液相转移催化下与芳胺反应，制得一系列新的含２－苯基－１，２，３－三唑环的硫脲衍生物，并经ＩＲ，＾１ＨＮＭＲ和元素进行了结构确证。     

N-(3-氟苯甲酰基)-N′-芳基硫脲衍生物的合成及其生物活性

在超声波辐射下,以PEG-400为相转移催化剂,通过3-氟苯甲酰氯与硫氰酸铵反应制得3-氟苯甲酰基异硫氰酸酯(2);2与芳胺反应,高产率地合成了11种未见文献报道的3-氟苯甲酰基硫脲衍生物(1)。初步生物活性实验结果表明,1对油菜幼苗的胚根生长具有明显的促进作用。     

N,N-二烯丙基甲基胺的相转移催化合成

相转移催化剂;聚乙二醇-400;N;N-二烯丙基甲基胺的相转移催化合成     

对羟基苯甲酸苄酯的合成

制备;相转移催化;对羟基苯甲酸苄酯的合成     

固-液相转移催化法合成N-芳酰基-N’-芳基硫脲衍生物及其生物活性

近年来相继报道，芳酰基硫脲衍生物对小麦根和苗的生长具有显著的促进生长功效，其效果优于2．4-二氯苯氧基乙酸和α-萘氧基乙酸等。为了进一步研究芳酰基硫脲类化合物的结构与生物活性之间的关系，本文于固液相转移催化剂条件下，以PEG-400为催化剂，合成了一系列N-芳酰基-N’-芳酰基硫脲衍生物。初步生物活性试验结果表明，目标化合物对小麦幼苗的生长有显著的促进功效。合成反应如下。     

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%.     

α-Amino acid derived enaminones and their application in the synthesis of N-protected methyl 5-substituted-4-hydroxypyrrole-3-carboxylates and other heterocycles

A new and simple synthesis of novel N-protected methyl 5-substituted-4-hydroxypyrrole-3-carboxylates, which exist in equilibrium with their 4-oxo tautomers, has been developed in two steps starting from N-protected α-amino acids. The key intermediates are enaminones, which can also be isolated, characterized, and used for the construction of other functionalized heterocycles, before they spontaneously decompose to pyrrole products. 4-Hydroxypyrroles are prone to partial aerial oxidation but can be efficiently alkylated or reduced to stable polysubstituted pyrrolidine derivatives.     

Specific intramolecular aromatic CH insertion of diazosulfonamides

The chemoselectivity in the intramolecular CH insertion of various diazosulfonamides has been experimentally studied. The results reveal that the aliphatic 1,4-, 1,5-, or 1,6-C(sp³)?H insertions of diazosulfonamides are not accessible, while the aromatic 1,5-C(sp²)?H insertion can be realized specifically by adjusting the diazo-adjacent group. In addition, the general chemoselectivities in the intramolecular CH insertions of diazosulfonyl compounds are summarized. Generally, diazosulfones undergo both aromatic 1,5-C(sp²)?H and aliphatic 1,5- and 1,6-C(sp³)?H insertions, while diazosulfonates undergo aliphatic 1,5- and 1,6-C(sp³)?H insertions. However, diazosulfonamides only undergo aromatic 1,5-C(sp²)?H insertion.     

N-Heterocyclic carbene-palladacyclic complexes: synthesis,characterization and their applications in the C-N coupling and α-arylation of ketones using aryl chlorides

N-Heterocyclic carbene-palladacyclic complexes 3 were successfully achieved in a one-pot procedure under mild conditions. The structure of 3a was unambiguously confirmed by X-ray single crystal diffraction and it was an active catalyst in the Buchwald-Hartwig amination and α-arylation of ketones even at very low catalyst loadings (0.01?mol%).     

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.     

Iodine-mediated oxidative Pictet-Spengler reaction using terminal alkyne as the 2-oxoaldehyde surrogate for the synthesis of 1-aroyl-β-carbolines and fused-nitrogen heterocycles

An efficient iodine-mediated oxidative Pictet-Spengler reaction in dimethyl sulphoxide (DMSO) using terminal alkynes as the 2-oxoaldehyde surrogate for the synthesis of aryl (9H-pyrido[3,4-b]indol-1-yl)methanones is described. The scope of the protocol includes the total synthesis of Fascaplysin, Eudistomins Y₁ and Y₂. The methodology is extended for preparing pyrrolo[1,2-a]-quinoxaline and indolo[1,5-a]quinoxaline derivatives. The utility of 1-aroyl-β-carbolines was demonstrated by performing palladium-catalyzed β-carboline directed ortho-C(sp2)-H functionalization of the phenyl ring with thiomethyl (SMe) group using DMSO as source and for accessing 4-aryl-canthin-6-ones.     

Facile synthesis of bicyclic 1-arylpyrazol-5-ones

In this Letter, we described a facile method for constructing fused bicyclic 1-arylpyrazol-5-one ring system. We employed various methylene-containing carboxylic acids as the substrates and proved that the pyrazolone ring closure requires activated methylene group in intermediate II. Accordingly, a series of structurally diversified, fused bicyclic 1-arylpyrazol-5-ones was prepared in moderate to high yields using the requisite substrates.     

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.