金鸡纳生物碱催化前手性双酸酐与二醇的聚合反应可提供高收率和高水平立体控制性的手性聚酯。聚酯的结构由1 H和13确定进行13 C NMR分析,而尺寸排阻色谱法(SEC)和MALDI-TOF质谱法均可估算其大小,这表明通过这种逐步增长的聚合反应可达到中等程度的聚合度。该方法的对映选择性是通过对聚酯化学控制选择性降解产生的双内酯进行手性HPLC分析来评估的。对于由双酸酐和二醇单体形成的低聚物,在反应性官能团之间带有刚性芳族间隔基,可获得最佳的立体控制。在这种情况下,平均对映选择性与在类似酸酐的简单酸酐开环过程中观察到的相当。相反,在反应性实体之间使用更灵活的间隔物通常导致较低的立体控制水平。
New bispyrazoline derivatives built around aliphatic chains: Synthesis, characterization and antimicrobial studies
作者:MOHAMAD YUSUF、PAYAL JAIN
DOI:10.1007/s12039-012-0355-9
日期:2013.1
Aspergillius janus, Aspergillus niger and Pencillium glabrum, respectively. The antimicrobial behaviour of the bispyrazolines 3a–3h is found to be dependent on the length of internal spacer unit. Synthesis and antimicrobial behaviour of the bispyrazolines built around the aliphatic chains have been described. The antimicrobial behaviour of these bisheterocyclic compounds is found to be dependent on the
Prospective new amidinothiazoles as leukotriene B4 inhibitors
作者:Ashraf A. Aly、Mahmoud A.A. Ibrahim、Essmat M. El-Sheref、Alaa M.A. Hassan、Alan B. Brown
DOI:10.1016/j.molstruc.2018.07.085
日期:2019.1
Abstract An efficient and one-step synthesis of the versatile, hitherto new derivatives resembling LY293111, a prospective potent antagonist of the leukotrieneB4 (LTB4) receptor, were reported. The strategy was based on the synthesis of an amidinothiazole ring, connected with phenoxy group. The synthesized compounds were structurally confirmed by IR, NMR (including 2D-NMR), mass spectra and elemental
Design, two-directional synthesis, DFT study of new pyrimido[5,4-d]pyrimidine-2,8-dione derivatives
作者:Ammar Sheykhi-Estalkhjani、Nosrat O. Mahmoodi、Asieh Yahyazadeh、Meysam Pasandideh Nadamani、Hossein Taherpour Nahzomi
DOI:10.1016/j.tet.2018.12.057
日期:2019.2
via an efficient reaction of premade bis-aldehydes and 1-(2-amino-1,2-dicyanovinyl)-3-phenylurea in the presence of triethylamine as the base and Cu (II) as catalyst. As there is controversy about the formation of two types of products, that is, purine or pyrimidinering containing compounds in the reaction of diaminomaleonitrile with isocyanates and aldehydes, the computational model chemistry has been
The Syntheses of 4,4′-(1,n-Dioxaalkane)-bisbenzaldehydes and 4,4′-(1,n-Dioxaalkane)-bis(α-methoxy Phenylacetic Acids)
作者:Jianjun Jiang、Edward L. Compere
DOI:10.1080/00397919808003072
日期:1998.3.1
acetic acids) were conducted using a base-catalyzed reaction. The reactants were potassium hydroxide (or lithium hydroxide/lithium chloride), bromoform, methanol and 4,4′-(1,n-dioxaalkane)-bisbenzaldehydes. The aldehyde starting materials were prepared using the Williamson ether synthesis, by condensing p-hydroxybenzaldehyde and 1,n-dibromoalkanes with lithiumhydride in ethanol. The effect of varying
摘要 4,4'-(1,n-二恶烷)-双(α-甲氧基苯乙酸)的合成采用碱催化反应进行。反应物为氢氧化钾(或氢氧化锂/氯化锂)、溴仿、甲醇和 4,4'-(1,n-二恶烷)-双苯甲醛。醛原料使用威廉姆森醚合成法制备,通过对羟基苯甲醛和 1,n-二溴烷烃与氢化锂在乙醇中的缩合。改变二氧杂烷烃桥单元中烃长度的影响是其酸式盐形成的一个重要考虑因素(桥中 CH2 单元的数量从 2 到 8 个不等)。†当前地址:D-54Z, R-13, Abbott Laboratories, 1401 Sheridan Road, North Chicago, IL 60064-4000。
Polyethylene glycol-bonded triethylammonium <scp>l</scp>-prolinate: a new biodegradable amino-acid-based ionic liquid for the one-pot synthesis of bis(pyrazolyl)methanes as DNA binding agents
catalyst for the one-potpseudo-five-componentsynthesis of bis(pyrazolyl)methanes. High synthesized product diversity was obtained with good to excellent yields and short reaction times. Also, some bis-products of bis(pyrazolyl)methanes as more complex products were prepared to show the generality and practical efficiency of the presented strategy. The cytotoxicity of the synthesized bis(pyrazolyl)methanes