两类氮芥衍生物的合成及其生理活性研究

设计合成了3个苯胺氮芥和6个萘酰亚胺-氮芥衍生物,产物结构均经1H NMR,13C NMR,ESI-MS和元素分析确认.使用MTT [3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide]法测试了9个化合物对HL-60,K562和SMMC-7721三种...     

含偶氮功能基团杯[4]冠醚衍生物的合成

合成了Cone和Partial-Cone两种构象的26,28-二(对硝基偶氮苯氧乙基)-杯[4]冠醚衍生物(3,4),其结构经1H NMR,13C NMR,ESI-Ms和元素分析表征.UV-vis分析表明,3在367nm处有最大吸收.比较了在两种不同的反应条件下3和4的分布.     

含苯并噁唑的L-酪氨酸衍生物的合成

从L-酪氨酸乙酯出发,经氨基保护、硝化、还原反应制得3-氨基-L-酪氨酸乙酯(4);4与苯甲醛或取代苯甲醛完成环化反应,合成了6个新的含苯并噁唑的L-酪氨酸衍生物,其结构经1H NMR,13C NMR,IR和元素分析表征.     

新型吡唑基咔唑衍生物的合成及其光学性质

以咔唑为原料,合成了一种新型的咔唑衍生物--9-丁基-3,6-二[3'-(5'-三氟甲基)吡唑基]咔唑(4),其结构经1H NMR,IR和MS表征.运用UV和单光子荧光光谱研究了中间体和4的光学性质,结果表明:4有望成为具有应用价值的发光材料.     

新型香豆素类衍生物的合成及其抗菌活性

以水杨醛及其衍生物为原料,通过缩合、水解、酰化、酯化四步反应合成了4个新的香豆素类衍生物-取代香豆素-3-酰水杨酸(4a～4d),其结构经uv,1H NMR,IR和元素分析表征.初步抗菌活性测试结果表明,4a-4d均有一定程度的抗真菌活性.     

新型双吲哚马来酰亚胺衍生物的合成

以1-(3-氧代四氢吡喃丙基)-吲哚-3-乙醛酸甲酯(5)和吲哚-3-乙酰胺(6)为原料,在催化剂叔丁醇钾的四氢呋喃溶液存在下发生偶合反应,经浓盐酸处理得脱保护的中间体7,再经甲磺酰化反应、氨解反应得到4种新的具有不同氨烷基侧链的双吲哚马来酰亚胺衍生物9a,9b,9d,9e.目标产物结构通过1H NMR,13C NMR,MS和HRMS确证.     

以(S)-(-)-α-甲基苄胺为手性源的蒽类衍生物的合成

从10-羟甲基-9-蒽醛出发,经过Williamson醚化反应引入手性源(S)-(-)-α-甲基苄胺,合成了3个新的手性蒽类衍生物,其结构经NMR, MS和元素分析表征.     

积雪草酸衍生物的合成与表征及体外抗癌活性的研究

为了寻找新型高效、低毒、生物活性良好的积雪草酸衍生物,以具有一定生物活性的积雪草酸为先导化合物,通过对其C-2,C-3,C-11,C-23和C-28位进行结构修饰,设计合成了9种未见文献报道的积雪草酸衍生物.目标化合物的结构经1H NMR,13C NMR,IR和HRMS表征确证.采用MTT法观察其对人宫颈癌细胞(Hela)、人乳腺癌细胞(MCF-7)的抑制作用.结果表明,经修饰的积雪草酸衍生物的抗癌活性较母体化合物有不同程度的增强.     

新型糖基化三氮唑香草醛席夫碱衍生物的合成

根据亚结构拼接原理,以芳草醛为原料,经醚化和Huisgen-Click反应制得中间体1-(2,3,4,6-四氧乙酰基-β-D-葡萄糖基)-4-(2-甲氧基-4-甲酰基苯氧基)甲基-1,2,3-三氮唑(3);3分别与9种芳胺反应,合成了9个新型的糖基化三氮唑香草醛席夫碱衍生物,收率68%~88%,其结构经1H NMR,IR,EI-MS和元素分析表征。     

苄连氮桥联双硫杂杯[4]芳烃的合成

硫杂杯[4]二醛基衍生物(1)在水合肼中肼解,合成了新化合物硫杂杯[4]二醛腙基衍生物(2);1和2在弱酸的催化下反应合成了新的具有对称结构的苄连氮双硫杂杯[4]芳烃(3);2和3的结构经1H NMR,IR,ESI-MS和元素分析表征.     

Towards click chemistry: Multicomponent reactions via combinations of name reactions

In this report, we try to show the importance of incorporation of name reactions in the sequential cascade reaction in which significantly decreasing the number of steps towards an ideal and practical multi-step synthesis of natural products as well showing virtually all the advantages already mentioned for “Click Chemistry”. In addition, since the chiral inductions are desired for most of these sequential name reactions, their asymmetric catalyzed reactions were also described.     

Recent advances in ionic liquids: green unconventional solvents of this century: part II

Abstract

In the second part of our paper, further recent developments of ionic liquids in selected name reactions of carbonyl chemistry such as Mannich, Reformatsky, Cannizaro, Streacker, Barbier, Pechmann, etc. are described.     

Competitive thermal ene reaction and Diels-Alder reactions of 2-[N-(alk-2-enyl)benzylamino]-3-vinylpyrido[1,2-a]pyrimidin-4(4H)-ones

Thermal reaction of 2-[N-(alk-2-enyl)benzylamino]-3-(2-substituted and 2,2-disubstituted)vinylpyrido[1,2-a]pyrimidin-4(4H)-ones gave azepine, the desired ene products, and/or pyran derivatives. The formation of the latter was responsible for the [4+2] cycloaddition reaction between the α,β-unsaturated ester carbonyl moiety as a diene part and the alkenylamino moiety as an ene one. The reaction features depended upon the kinds of substituents both on the vinyl and alkenyl counterparts; strongly electron-withdrawing substituents on the vinyl moiety or an electron-donating substituent on the alkenyl one changed the reaction feature from the ene reaction to the hetero Diels-Alder reaction.     

Palladium bis(2,2,6,6-tetramethyl-3,5-heptanedionate) catalyzed Suzuki, Heck, Sonogashira, and cyanation reactions

Palladium bis(2,2,6,6-tetramethyl-3,5-heptanedionate): a structurally well-defined O-containing transition metal complex is reported as an efficient catalyst for Suzuki, Heck, and Sonogashira cross-coupling reactions. The protocol was also applied successfully for cyanation of aryl halides under milder operating conditions. The system tolerated the coupling of various aryl halides with alkenes, alkynes, and organoboronic acid along with the cyanation of aryl halides providing good to excellent yields of desired products.     

Boehmite@tryptophan‐Pd nanoparticles: A new catalyst for C–C bond formation

A boehmite@tryptophan‐Pd nanoparticulate catalyst was prepared by a simple, fast and convenient route. The nanomaterial was characterized using various techniques and employed as a thermally stable catalyst for Heck, Stille and Suzuki cross‐coupling reactions. Optimized conditions for these reactions are described. The catalyst could be isolated, post‐reaction, by simple filtration and recycled for several consecutive cycles without a notable change in its activity.     

温度和时间对有机合成反应影响的探讨

根据物理化学和有机合成原理,从动力学、热力学、反应机理及溶解度等各方面详细分析了反应温度和反应时间对有机合成反应的影响。通过这些分析,可以让同学们更好地在合成反应课程的学习中掌握和分析反应温度和反应时间对反应的影响。     

Oxa-Michael加成反应的研究新进展

Oxa-Michael加成反应是一类重要的反应, 经常被用于天然产物的合成, 但该反应直到近几年才被深入研究. 简要综述了oxa-Michael加成反应的研究进展.     

Tandem Hass-Bender/Henry reaction for the synthesis of dimethylnitro alcohols from benzylic halides

Dimethylnitro alcohols are constructed in a one-pot process from benzylic halides and 2-nitropropane. The use of tetrabutylammonium fluoride (TBAF) as the promoter is essential for this tandem Hass-Bender/Henry reaction to proceed.     

钯催化的交叉偶联反应——2010年诺贝尔化学奖获奖工作介绍

钯催化的交叉偶联反应是非常实用的合成新方法.文章给出了Heck反应、Negishi反应和Suzuki反应的概念,对其反应机理作了详细的说明,并对其在复杂化合物和天然产物全合成中的应用作了评价.     

具有相同简单级数的不同反应类型的半衰期公式

化学反应的半衰期公式不仅与反应级数有关,而且与反应类型相关。具有相同简单级数的不同类型反应的半衰期表达式也往往不一致。对具有简单级数反应的半衰期表达式进行了分析,重点讨论了不同类型的二级反应和三级反应半衰期表达式的特点及其他们之间的内在联系和区别。