4-乙酰基-2-硝基苯甲醛的简便合成

从4-乙酰基-2-硝基甲苯出发, 经溴化、羟化、氧化以88.5%的总收率制备得到4-乙酰基-2-硝基苯甲醛.     

3-氨基-二氢噻吩-2-酮类Schiff碱的合成和生物活性研究

通过3-氨基-二氢噻吩-2-酮(DL-高半胱氨酸硫内酯)盐酸盐与取代苯甲醛反应, 得到3-氨基-二氢噻吩-2-酮类Schiff碱. 合成了9个化合物, 其中7个为首次报道的新Schiff碱类化合物. 化合物结构经IR, ¹H NMR和元素分析证实, 并对这些化合物进行了室内毒力测试, 结果表明此类化合物具有很好的杀菌、抑菌活性.     

N-取代乙醇胺对4-氟-1-酰基苯的选择性胺化反应

研究了4-氟-1-酰基苯和N-取代乙醇胺在酰胺类溶剂或不加溶剂中反应, 在不需要金属催化剂和另外加碱的条件下选择性地得到胺化产物, 实验操作简单, 符合S_NAr取代机理. 一系列羟乙基胺基酰基苯产物均经过元素分析(HRMS), IR, MS和NMR的测定.     

A new method for inversion of hydroxyl group of carbocyclic nucleosides

The hydroxyl group of carbocyclic nucleosides was inversed when the compounds were treated with Me_3SiCl,KCN and a catalytic amount of NaI in DMF/CH_3CN.     

An Efficient and Green Synthesis of 5-Oxo-5, 6, 7, 8-tetrahydro- 4H-benzo-[b]-pyran Derivatives Promoted by InCl_3·4H_2O Under Microwave Irradiation

Construction of tetrahydropyran rings has attracted a great deal of interests in organic synthesis in recent years1, since tetrahydropyran moiety constitutes a structural unit in a number of natural products2. In addition, tetrahydropyran derivatives possess wide range of biological activities and pharmacological properties, such as anticancer activity3 and antihypersensitivity4. Many methods for the preparation of such compounds have already been developed5. Among them, condensation of α, β…     

Improving the catalytic activity of Candida antarctica lipase B by circular permutation

Lipases (EC 3.1.1.3) play an important role in asymmetric biocatalysis. Tailoring these enzymes to novel, unnatural substrates is one of the primary challenges of protein engineering. We have used circular permutation, the intramolecular relocation of a protein's N- and C-termini, to explore the effects of altered active site accessibility and protein backbone flexibility on the catalytic performance of lipase B from Candida antarctica (CALB). Our combinatorial approach identified 63 unique functional protein permutants of CALB, and kinetic analysis of selected candidates indicated that a majority of enzyme variants either retained or surpassed wild-type CALB activity on a series of standard substrates. Beyond the potential benefits of these tailor-made lipases as new catalysts for unnatural substrates, our study validates circular permutation as a promising general method for lipase engineering.     

甲烷氧化偶联Ti-La-Li系混合氧化物催化剂

研究了Ti-La-Li三元氧化物的组成、结构及其对甲烷氧化偶联反应的催化性能；用XRD、IR、XPS和SEM等方法对催化剂进行表征，结果表明：在LiTi_xLa_(1-x)O_2系列催化剂中，随x值的不同，可生成LaTi_(1－y)Li_yO_(3-λ)、Li_2TiO_3、La_(0.66)TiO_(2.993)、La_2O_3和Li_(1.33)Ti_(1.66)O_4几种物相，其中，钙钛矿到三元复合氧化物LaTi_(1-y)Li_yO_(3-λ)是甲烷氧化偶联反应的主要活性相，活性位Li~＋-O~－-Ti~(3＋)的形成是活性提高的主要原因．Li_2TiO_3和La_(0.66)TiO_(2.993)是深度氧化活性相，而Li_(1.33)Ti_(1.66)O_4既无偶联活性，也无深度氧化活性．     

The Unusual Spectrum of the Mixture of Tin-octabutoxy Naphthalocyanine and SnCl2 in CH2Cl2

The Q-band position of tin-centered 5, 9, 14, 18, 23, 27, 32, 36-octabutoxy 2, 3-phthalocyanine(SnNc(OBu)8) exhibits dramatic red-shift as mixed with SnCl2 in CH2Cl2.     

THERMAL PROPERTY, MISCIBILITY AND CRYSTALLIZATION BEHAVIOR OF POLY（3-HYDROXYBUTYRATE-co- 3-YDROXYHEXANOATE） AND POLY（BUTYLENE SUCCINATE-ADIPATE） （PHBHHX/PBSA） BLENDS

Blends of poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) (PHBHHx) and poly(butylene succinate-adipate) (PBSA), both biodegradable semicrystalline polyesters, were prepared with the ratio of PHBHHx/PBSA ranging from 80/20 to 20/80 by melt mixing method. Differential scanning calorimetry (DSC), thermogravimetry analysis (TGA), dynamic mechanical thermal analysis (DMA), polarizing optical microscopy (POM) and wide angle X-ray diffractometer (WAXD) were used to study the miscibility and crystallization behavior of PHBHHx/PBSA blends. Experimental results indicate that PHBHHx is immiscible with PBSA as shown by the almost unchanged glass transition temperature and the biphasic melt.     

三乙胺与2-氯-5-甲氧基对苯醌光电子转移反应的CIDNP研究

用化学诱导动态核极化（CIDNP）方法研究了三乙胺与2-氯-5-甲氧基对苯醌在 C6D6，CH3CN溶剂中的反应机理，实验结果表明反应过程中首先形成基态电荷转移 络合物（CTC），在CD3CN中，光照电荷分离形成离子自由基对，使三乙胺亚甲基产 生发射极化信号。同时用UV-vis实验证实CTC的存在。