A convenient procedure for the preparation of α-iodo ketones by oxidativeiodination of ketones using iodine and m-iodosylbenzoic acid as a recyclablehypervalentiodine oxidant is reported. Various ketones and β-dicarbonyl compounds can be iodinated by this reagent system under mild conditions affording the respective α-iodo-substituted carbonyl compounds in excellent yields. The final products of
使用用于通过酮的氧化碘化制备α碘酮的方便方法碘和中号作为可回收高价碘氧化剂报道-iodosylbenzoic酸。该试剂体系可以在温和的条件下碘化各种酮和β-二羰基化合物,从而以优异的产率提供各自的α-碘取代的羰基化合物。碘化的最终产物可方便地从由副产物简单处理分离与阴离子交换树脂的Amberlite IRA 900 HCO 3 -和蒸发溶剂后以良好的纯度分离出来。高价碘氧化剂的还原形式m通过用盐酸水溶液处理,然后用乙酸乙酯萃取,可以以91-95%的收率从Amberlite树脂中回收-碘苯甲酸。 卤化-碘-酮-亚碘酰苯-米-iodosylbenzoic酸-高价碘
Direct Metal-free α-Iodination of Arylketones Induced by Iodine or Iodomethane with HTIB in Ionic Liquid
作者:Jong-Chan Lee、Ji-Mi Kim、Hyun-Jung Park、Byung-Mook Kwag、Seung-Bae Lee
DOI:10.5012/bkcs.2010.31.5.1385
日期:2010.5.20
activation of iodine by HTIB, with the enol tautomer of aryl- ketones. We next examined α-iodination of 1,3-diketones since preparation of 2-iodo-1,3-dicarbonyl compounds were known to be difficult. 11
NBS-mediated sequential one-pot synthesis of multifunctionalized thiazoles and thiophenes from 1,3-dicarbonyl compounds and mercaptonitrile salts
作者:Laichun Luo、Lanlan Meng、Qi Sun、Zemei Ge、Runtao Li
DOI:10.1016/j.tetlet.2013.11.014
日期:2014.1
A NBS-mediated sequential one-pot synthesis of multifunctionalized thiazoles and thiophenes from 1,3-dicarbonyl compounds and mercaptonitrile salts has been developed under mild conditions. This transformation involves sequential bromination/SN2 alkylation/Thorpe–Zieglercyclization/regio-selective elimination of a –COR group, affording the desired products in moderate to good yields. The sequence
由NBS介导的从1,3-二羰基化合物和硫醇腈盐开始的多官能噻唑和噻吩的顺序一锅法合成已经在温和的条件下进行。该转化涉及顺序溴化/ S N 2烷基化/索普-齐格勒环化/ -COR基团的区域选择性消除,以中等至良好的收率提供所需的产物。确定了-COR基团离去反应的顺序,并提出了可能的机制。
Iodine-catalyzed C–H/S–H oxidative coupling: from 1,3-diketones and thiophenols to β-dicarbonyl thioethers
作者:Hao Cao、Jiwen Yuan、Chao Liu、Xinquan Hu、Aiwen Lei
DOI:10.1039/c5ra04906g
日期:——
A novel I2-catalyzed Csp3-H/S–H oxidative coupling between alkyl 1,3-diketones and thiophenols to form β-carbonyl thioethers was demonstrated.
A novel facile method for the traceless solid-phase synthesis of α-iodo ketones using a recyclable resin-bound selenium bromide reagent is reported. Various ketones and β-dicarbonylcompounds can be converted to the corresponding α-iodo-substituted compounds in excellent yields and purities with simple workup procedure and mild conditions.