盐酸美西律对映体的毛细管电泳分离

以β－环糊精的两种生物做为毛细管电泳手性分离添加剂，对盐酸美西律的对映体进行了拆分研究。其中，２，６－Ｏ－二甲基β－环糊精可将对映体部分拆分，而２，３，６－Ｏ－三甲基β－环糊精时，可基线分离对映体。研究了两种甲基化β－环糊精的浓度及工作电压对分离的影响。     

以2-O-单取代羟丙基β-环糊精用于毛细管电泳手性分离添加剂

本文研究了一种新的环糊精衍生物2－O－单取代羟丙基β－环糊精做为毛细管电泳手性分离添加剂时，对3种碱性药物对映体；扑尔敏，麻黄碱，心得安的拆分性能。并与β－环糊精，2．6－O－二甲基β－环糊精，多取代2－O－羟丙基β－环糊精的手性识别性能做了对比。     

毛细管电泳磺丁基-β-环糊精拆分对映体

将平均取代度为３．８的负电性磺丁基－β－环糊精手性添加剂应用于毛细管电泳对映体拆分的研究中。考察了背景电解质pＨ及磺丁基－β－环糊精浓度对手性拆分的影响,应用磺 丁基－β－环糊精拆分八对碱性酸性的药物对映体。     

对萘普生和萘普生甲酯的毛细管电泳手性分离

以磺化β－ＣＤ作为手性分离添加剂,分别对萘普生和萘普生甲酯进行了手性分离研究,当磺化β－ＣＤ的浓度为３．５％（Ｗ／Ｖ）时,萘普生和萘普生甲酯的手性分离度都可大于２,但萘普生与萘普生甲酯不能达到同时拆分。如果同时以磺化β－ＣＤ和ＨＰ－β－ＣＤ作为作为手性分离添加剂,则可对萘普生甲酯达到同时拆分,当磺化β－ＣＤ和ＨＰ－β－ＣＤ的浓度分别为３．５％和１．５％（Ｗ／Ｖ）时,对萘磺生和萘普生甲酯两种消旋体的     

手性氨基醇（R）－2－氨基－1，1－二苯基－3－（2－萘基）－1－丙醇：制备及其对前手性酮硼烷还原的对映选择性催化作用

用丙二酸酯法合成了Ｎ－乙酰基－３－（２－萘基）－ＤＬ－α－丙氨酸乙酯３．３经酶法拆分，得光学活性的Ｄ－３，后者经盐酸水解、酯化后再与苯基溴化镁作用，制得标题化合物６。在０．５ｍｍｏｌ６存在下，用过量硼烷对一系列前手性酮还原，得到了相应的光学活性二级醇。对映体过量（ｅ．ｅ值）５７．０～１００％。     

基于二元手性选择剂协同作用的毛细管电泳拆分氨基酸对映体研究

氨基酸的手性拆分在生命的起源、发育、病变及衰老研究中均有重要的意义．虽然已有基于色谱和毛细管电泳的拆分方法,但由于氨基酸种类繁多,性质各异,因而具有广泛拆分能力的普适性拆分方法还很有限．组合运用手性选择剂是提高手性分离选择性和分离度的一种有效的方法［1-3]．为此,我们以毛细管电泳－激光诱导荧光检测（CE－LIF）为分析手段,研究了手性选择剂的添加组合,获得了一些具有一定广谱拆分性能的二元手性选择剂协同体系．本文以β-环糊精（β-CD）和牛磺胆酸钠（STC）为拆分体系,对20种氨基酸的异硫氰酸酯荧光素（FITC）衍生物进行手性拆分,分离度均在1．9     

手性氨基醇（R）—2—氨基—1,1—二苯基—3—（2—萘基）—1—丙醇：制备及其对…

用丙二酸酯法合成了Ｎ－乙酰基－３－（２－萘基）－ＤＬ－α－丙氨酸乙酯３。３经酶法拆分，得光学活性的Ｄ－３，后者经盐酸水解，酯化后再与苯基化镁作用，制得到标题化合物６。对映体过量（ｅ．ｅ值）５７，６％－１００％。     

手性添加剂磺丁基—β—环湖精的合成及毛细管电泳手性分离

以磺丁内酯为衍生试剂合成了两种不同取代度的磺丁基－β－环湖精,并对合成产物进行了表征,以这两种负电性的磺丁基－β－环湖精衍生物作为毛细这电泳手性添加剂,考察了它们对酸、碱性手性药物的手性拆分性能,以及不同取代度对手性拆分的影响。     

毛细管电动色谱带电环糊精拆分N—FMOC氨基酸对映体

将负电性磺丁基－β－环糊精手性添加剂应用于毛细管电泳氨基酸对映体的拆分研究中,对８种氨基酸对映体与９－芴甲基氧基甲酰氯（ＦＭＯＣ－Ｃｌ）生成的衍生物进行了分离,其中５种得到了基线分离。考察了背景电解质ｐＨ值及磺丁基－β－环糊精的浓度对Ｎ－ＦＭＯＣ氨基酸对映体拆分的影响。     

磺化β-环糊精手性添加剂毛细管电泳对映体拆分的研究

将平均取代度为６．５的负电性磺化β－环糊精手性添加剂应用于毛细管电泳对映体拆分的研究中。在不同电极性条件下,考察了背景电解质ｐＨ值及磺化β－环糊精浓度对手性拆分的影响,并应用磺化β－环糊精拆分酸性,碱性和中性的手性化合物。     

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%.     

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.     

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.     

A general and convenient synthesis of 4-(tosylmethyl)semicarbazones and their use in amidoalkylation of hydrogen,heteroatom, and carbon nucleophiles

A general synthesis of previously unknown semicarbazone-based α-amidoalkylating reagents, 4-(tosylmethyl)semicarbazones, has been developed. The synthesis involved three-component condensation of semicarbazones of aliphatic or aromatic aldehydes with the same or other aldehydes and p-toluenesulfinic acid. The scope and limitations of this reaction were investigated. The compounds obtained were demonstrated to be an efficient α-(4-semicarbazono)alkylating agents. They were reacted with H- (sodium borohydride), O- (sodium methylate), S- (sodium phenylthiolate), N- (pyrrolidine, sodium succinimide), P- (trialkyl phosphites), and C-nucleophiles (sodium diethyl malonate) to give the corresponding products of the tosyl group substitution, 4-substituted semicarbazones, including analogues of nitrofurazone. Among the prepared compounds tested in vitro for antibacterial and antifungal activity, three nitrofuryl-containing semicarbazones exhibited high biological activities with minimum inhibitory concentration (MIC) values of 8–32 μg/mL.     

Synthesis of novel chiral bidentate hydroxyalkyl-N-heterocyclic carbene ligands and their application in palladium-catalyzed Mizoroki–Heck couplings and asymmetric addition of diethylzinc to benzaldehyde

A small library of new chiral bidentate hydroxyalkyl-imidazolium salts 1 is conveniently synthesized on multi-gram scale from inexpensive and commercially available chiral pool amino acids. The corresponding carbenes, generated by deprotonation of imidazolium salts 1, in combination with palladium(II) chloride were tested in the Mizoroki–Heck coupling reaction. The most significant results in terms of yields and reactivities were achieved with low catalyst loading. The catalytic activities of these imidazolium salts were also investigated in the asymmetric addition of diethylzinc to benzaldehyde. The use of MgO nanoparticles as an additive in conjunction with these ligands played a crucial role in increasing the efficiency of these reactions.     

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.     

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%).     

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.