Barbier-Type Allylation of Aldehydes and Ketones with Metallic Lead in Aqueous Media
作者:Jing-Yao Zhou、Yu Jia、Guang-Fu Sun、Shi-Hui Wu
DOI:10.1080/00397919708006791
日期:1997.6
Abstract Homoallylic alcohols can be obtainedfromallylation of aldehydes and ketones with allyl bromide promoted by metallic lead. These reactions can be carried out smoothly in aqueous media.
摘要 醛和酮与烯丙基溴在金属铅的促进下烯丙基化可制得高烯丙醇。这些反应可以在水性介质中顺利进行。
Development of the Traceless Phenylhydrazide Linker for Solid-Phase Synthesis
作者:Frank Stieber、Uwe Grether、Herbert Waldmann
DOI:10.1002/chem.200304820
日期:2003.7.21
couplings, as well as Wittig and Grignard reactions. Traceless release of the coupling products from the solidsupport is achieved selectively under mild conditions and in high purity by oxidation of the aryl hydrazides to acyl diazenes with Cu(II) salts or N-bromosuccinimide (NBS) and subsequent nucleophilic attack of the acyl diazene intermediates. Traceless cleavage by oxidation with NBS can be carried
Organocatalytic Trapping of Elusive Carbon Dioxide Based Heterocycles by a Kinetically Controlled Cascade Process
作者:Chang Qiao、Alba Villar‐Yanez、Josefine Sprachmann、Bart Limburg、Carles Bo、Arjan W. Kleij
DOI:10.1002/anie.202007350
日期:2020.10.12
A conceptually novel approach is described for the synthesis of six‐membered cyclic carbonates derived from carbon dioxide. The approach utilizes homoallylic precursors that are converted into five‐membered cyclic carbonates having a β‐positioned alcohol group in one of the ring substituents. The activation of the pendent alcohol group through an N‐heterocyclic base allows equilibration towards a thermodynamically
Indium‐mediated allylation of carbonyl compounds in deep eutectic solvents
作者:Nerea González‐Gallardo、Beatriz Saavedra、Gabriela Guillena、Diego J. Ramón
DOI:10.1002/aoc.6418
日期:2021.12
This study describes, for the first time, the in situ generation of indium organometallic reagents in environmentally friendly deep eutectic solvents (DESs). The allylation process of different carbonyl compounds is achieved mediated by indium metal and using cheap allyl chloride derivatives. The unique DES properties allow to perform the reaction at room temperature and under air, obtaining yields
这项研究首次描述了在环境友好的低共熔溶剂 (DESs) 中原位生成铟有机金属试剂。不同羰基化合物的烯丙基化过程是通过金属铟和使用廉价的烯丙基氯衍生物来实现的。独特的 DES 特性允许在室温和空气下进行反应,获得 45% 到 99% 的产率。可以将反应介质循环至少四个连续循环,而不会显着降低观察到的结果。此外,还观察到反应产率与 DES 密度之间的线性相关性。
Efficient Solvent-Free Synthesis of Homoallylic Alcohols Mediated by Zinc-Copper Couple
作者:Jin-Xian Wang、Wenjun Zhou、Wenjun Yan、Kehu Wang
DOI:10.1055/s-2007-1000840
日期:2008.1
Under solvent-free conditions, it was found that zinc-copper couple could efficiently mediate the Barbier-type reaction of ketones and allyl bromide to give the corresponding homoallylic alcohols in high to excellent yields at room temperature.