Expeditious Solvent-Free Synthesis of Chromene Derivatives via Three- Component Reactions of N-Nucleophiles
作者:Mohammad R. Hosseini-Tabatabaei、Faramarz Rostami-Charati
DOI:10.2174/138620712803901126
日期:2012.11.7
Multicomponent reactions involving 4-hydroxycumarine, activated acetylenic compounds and N-nucleophiles under solvent-free conditions were investigated. The reactions could also be extended to quinoline or CH-acides. Substituted chromen could be obtained from this routine, which may have potential applications in drugs fields.
Multicomponent formation route to a new class of oxygen-based 1,3-dipoles and the modular synthesis of furans
作者:Huseyin Erguven、Cuihan Zhou、Bruce A. Arndtsen
DOI:10.1039/d1sc04088j
日期:——
generated by the multicomponent reaction of aldehydes, acid chlorides and the phosphonite PhP(catechyl). These 1,3-dipoles are formally cyclic tautomers of simple Wittig-type ylides, where the angle strain and moderate nucleophilicity in the catechyl-phosphonite favor their cyclization and also direct 1,3-dipolarcycloaddition to afford single regioisomers of substituted products. Coupling the generation
A Unified Continuous Flow Assembly-Line Synthesis of Highly Substituted Pyrazoles and Pyrazolines
作者:Joshua Britton、Timothy F. Jamison
DOI:10.1002/anie.201704529
日期:2017.7.17
molecular diversity in short order. Continuous flowsynthesis enables the safe handling of diazoalkanes at elevated temperatures, and the use of aryl alkyne dipolarphiles under catalyst-free conditions. This assembly-line synthesis provides a flexible approach for the synthesis of agrochemicals and pharmaceuticals, as demonstrated by a four-step, telescoped synthesis of measles therapeutic, AS-136A, in a total
A convenient synthesis of alkyl-2-(2-imino-4-oxothiazolidin-5-ylidene)acetate derivatives involving an electrogenerated base of acetonitrile
作者:Najoua Sbei、Baya Haouas、Monia Chebbi、Youssef Ben Smida、Youssef Arfaoui、Khaled Boujlel、Mohamed Lamine Benkhoud
DOI:10.1080/17415993.2016.1259416
日期:2017.3.4
ABSTRACT We report a simple method for the synthesis of alkyl-2-(2-imino-4-oxothiazolidin-5-ylidene) acetate derivatives 3 in good yields under mild conditions. The electrogenerated cyanomethyl base (EGB), obtained from electroreduction of acetonitrile-0.1 M TBABF4, assists the reaction between thiourea derivatives 1 and dialkyl acetylene dicarboxylate 2. The expected products, 3/4, and the structure
摘要 我们报告了一种在温和条件下以良好收率合成烷基-2-(2-imino-4-oxothiazolidin-5-ylidene) 乙酸酯衍生物 3 的简单方法。从乙腈-0.1 M TBABF4 的电还原获得的电生成的氰甲基碱 (EGB) 有助于硫脲衍生物 1 和乙炔二羧酸二烷基酯 2 之间的反应。预期的产物 3/4 和从 X 射线衍射获得的结构证实主要产物是五元杂环3。此外,基于从量子计算获得的热力学和动力学数据,提出了解释反应途径的机制。图形概要
N-PROTONATED AZOMETHINE YLIDES WITH A LEAVING GROUP AS SYNTHETIC EQUIVALENTS FOR NONSTABILIZED NITRILE YLIDES
作者:Otohiko Tsuge、Shuji Kanemasa、Koyo Matsuda
DOI:10.1246/cl.1985.1411
日期:1985.9.5
steps, N-(silylmethyl)amidines generate N-protonated azomethine ylides which cycloadd to olefins, acetylenes, and aldehydes giving 1- or 2-pyrrolines, pyrroles, and 2-oxazolines, respectively, after the elimination of N-substituted anilines. With this sequence, the amidines are useful synthetic equivalents of nonstabilized nitrileylides.