Intercepting the Banert cascade with nucleophilic fluorine: direct access to α-fluorinated <i>N</i>H-1,2,3-triazoles
作者:J. R. Alexander、P. V. Kevorkian、J. J. Topczewski
DOI:10.1039/d1cc01179k
日期:——
The treatment of propargylic azides with silver(I) fluoride in acetonitrile was found to yield α-fluorinated NH-1,2,3-triazoles via the Banert cascade. The reaction was regioselective and the products result from an initial [3,3] rearrangement. The reaction is demonstrated on >15 examples with yields ranging from 37% to 86%.
Palladium(II)-Catalyzed Directed <i>anti-</i>Hydrochlorination of Unactivated Alkynes with HCl
作者:Joseph Derosa、Annabelle L. Cantu、Mark N. Boulous、Miriam L. O’Duill、Joshua L. Turnbull、Zhen Liu、Daizy M. De La Torre、Keary M. Engle
DOI:10.1021/jacs.7b00892
日期:2017.4.12
A regioselective anti-hydrochlorination of unactivated alkynes is reported. The reaction utilizes in situ generated HCl as the source of both the Cl- and H+ and is catalyzed by palladium(II) acetate, with loadings as low as 25 ppm. Removable picolinamide and 8-aminoquinoline bidentate directing groups are used to control the regioselectivity of the chloropalladation step and stabilize the resulting
报道了未活化炔烃的区域选择性抗氢氯化作用。该反应利用原位生成的 HCl 作为 Cl- 和 H+ 的来源,并由乙酸钯 (II) 催化,负载量低至 25 ppm。可去除的吡啶甲酰胺和 8-氨基喹啉二齿导向基团用于控制氯钯化步骤的区域选择性,并稳定所得的链烯基钯 (II) 中间体,用于随后的原脱钯反应。该方法提供了以优异的产率和高区域选择性获得广泛的取代链烯基氯的途径。这种转化的产物通过 Stille 偶联成功衍生为多种三取代烯烃产物。进行了反应进程动力学分析,揭示了该催化过程的可能机制。
Chemoselective and Direct Functionalization of Methyl Benzyl Ethers and Unsymmetrical Dibenzyl Ethers by Using Iron Trichloride
tertiary benzylic positions of methylbenzylethers or unsymmetrical dibenzyl ethers and is also applicable to direct allylation, alkynylation, and cyanation reactions, as well as the azidation. The present methodologies provide not only a novel chemoselectivity but also the advantage of shortened synthetic steps, due to the direct process without the deprotection of the methyl and benzylethers.
Divergent Mechanisms of the Banert Cascade with Propargyl Azides
作者:Juliana R. Alexander、Mary H. Packard、Alanna M. Hildebrandt、Amy A. Ott、Joseph J. Topczewski
DOI:10.1021/acs.joc.9b03061
日期:2020.3.6
heterocycles for a variety of applications. The synthesis of 1H-triazoles can be accomplished by the Banert cascade from propargylic azides. Depending on the substrate and conditions, the Banert cascade can proceed by either a sigmatropic or prototropic mechanism. This report describes the first detailed kinetic analysis of the Banert cascade proceeding by both pathways including substituent effects and KIE. The