共查询到20条相似文献,搜索用时 78 毫秒
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使用廉价易得的邻烯基甲酰苯胺在可见光的诱导下发生自由基环化反应, 以良好至优秀的产率合成了15种2-喹啉酮衍生物. 该方法简单高效、 条件温和、 产率较高, 具有优异的官能团兼容性, 不仅拓展了邻烯基甲酰苯胺参与的新型有机反应, 也为光催化合成喹啉酮类化合物提供了一条新途径. 相似文献
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发展了一种可见光诱导的1,7-烯炔与全氟烷基卤串联原子转移自由基加成(ATRA)/环化合成含氟2,4-二氢异喹啉-2(1H)-酮的反应。以多氟烷基碘或溴为自由基前体,面式-三( 2-苯基吡啶)合铱(摩尔分数1%)为光敏剂,在5 W蓝光发光二极管(LED)照射下,多种苯桥联1,7-烯炔顺利发生串联(ATRA)/环化反应,以中等到优秀(62%~84%)的产率合成了一系列多氟化异喹啉酮衍生物。 此合成方法反应条件温和、清洁、高效且底物适用范围广,为具有潜在药用价值的多氟化2,4-二氢异喹啉-2(1H)-酮的合成提供新的途径。 相似文献
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We have systematically studied the reactions of acetalization and found that high reaction efficiency can be achieved using cheap and readily available organic Eosin Y as catalyst. The reaction proceeds smoothly under house bulbs and shows excellent functional group tolerance. The substrates of the reaction system are compatible with aromatic aldehydes, aliphatic aldehydes, aromatic ketones, and cyclic ketones with high yields. 相似文献
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Eosin Y catalyzes efficiently the visible light mediated coupling of sp(3) C-H bonds adjacent to the nitrogen atom in tetrahydroisoquinoline derivatives in the absence of an external oxidant. Nitroalkanes, dialkyl malonates, malononitrile, and dialkyl phophonates were used as pronucleophiles in this metal-free, visible light oxidative coupling reaction. 相似文献
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氨基酸残基对探针分子的荧光猝灭行为可以为生物大分子的结构及构象动力学研究提供重要的信息.本文运用飞秒瞬态吸收光谱和时间相关单光子计数实验系统研究了在水(H2O)和氘代水(D2O)溶液中乙酰基取代酪氨酸(AcTyr)对Eosin Y的超快荧光猝灭动力学过程.发现导致AcTyr对Eosin Y荧光猝灭的主要原因是由于它们之间形成了短寿命的基态复合物.我们还发现Eosin Y与AcTyr形成的基态复合物的激发态寿命具有明显的动力学同位素效应,表明AcTyr对Eosin Y的荧光猝灭是通过质子耦合电子转移过程发生的. 相似文献
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Synthesis of quinoxaline derivatives catalyzed by PEG-400 总被引:1,自引:0,他引:1
<正>Polyethylene glycol(PEG) was found to be an effective catalyst for the condensation of 1,2-diamines with 1,2-dicarbonyl compounds to afford the corresponding quinoxaline derivatives in excellent yields under mild reaction conditions. 相似文献
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伊红Y分光光度法测定血清白蛋白 总被引:8,自引:0,他引:8
在 p H 3.2 9缓冲介质中 ,牛血清白蛋白与伊红 Y结合 ,形成 EY- BSA复合物 ,以试剂空白参比 ,在 5 4 5 nm处产生一灵敏的吸收峰 ,BSA的浓度在 0~ 1 .6×1 0 - 7mol/L范围内与 5 4 5 nm处的吸光度呈良好的线性关系 ,摩尔吸光系数 ε=2 .1 2× 1 0 6 L· mol- 1· cm- 1,Sandell灵敏度为 0 .0 32 μg/cm2 ,方法对 BSA的检出限为9.2× 1 0 - 9mol/L。本法具有灵敏度高、选择性好等特点 ,用于人血清样品中蛋白质的测定 ,与经典的考马斯亮蓝 G- 2 5 0方法结果一致 相似文献
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Thibault Thierry Dr. Emmanuel Pfund Prof. Thierry Lequeux 《Chemistry (Weinheim an der Bergstrasse, Germany)》2021,27(60):14826-14830
A metal-free α-aminomethylation of heteroaryls promoted by eosin Y under green light irradiation is reported. A large variety of α-trimethylsilylamines as precursor of α-aminomethyl radical species were engaged to functionalize sulfonyl-heteroaryls following a Homolytic Aromatic Substitution (HAS) pathway. This method has provided a range of α-aminoheteroaryl compounds including a functionalized natural product. The mechanism of this late-stage functionalization of aryls was investigated and suggests the formation of a sulfonyl radical intermediate over a reductive quenching cycle. 相似文献
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《Green Chemistry Letters and Reviews》2013,6(4):269-273
Abstract Alum (KAl(SO4)2·12H2O) performs as a novel catalyst for the synthesis of anthraquinone derivatives from phthalic anhydride and substituted benzenes in good to excellent yields (70–96%) using water as a solvent at ambient temperature. Several solvents were examined for this reaction; however, in terms of reaction yield and time, water was found to be the optimum solvent. The remarkable advantages offered by this method are an inexpensive and easily available catalyst, a simple procedure, mild conditions, and much faster (60–120 min) reactions. 相似文献
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A self-assembled Pd_4L_2 cage is employed as a water-soluble molecular flask for the synthesis of functionalized coumarins from a series of salicylaldehyde derivatives and cyanoacetates/malononitrile. The catalytic reaction features mild aqueous conditions and broad substrate scope. Crystal structures of the host-guest complexes for two substrates and one analogous intermediate have been obtained, shedding light on the supramolecular reaction mechanism. Michaelis-Menten kinetic studies were performed in one typical case, revealing that the rate of product formation has been enhanced by over 23-fold in contrast to the background reaction without cage. Moreover, the same reaction catalyzed by a smaller Pd_6L_4 cage gives a mixture of products and much lower yields, suggesting that fine-tuning on the size and symmetry of the cages' cavity is crucial for their applications in supramolecular catalysis. 相似文献