Atroposelective Haloamidation of Indoles with Amino Acid Derivatives and Hypohalides
作者:Zhaojie Li、Menghan Tang、Chenyang Hu、Shouyun Yu
DOI:10.1021/acs.orglett.9b03456
日期:2019.11.1
atroposelective coupling of indoles with chiral amino acid-based sulfonamides mediated by hypohalides is described. A series of 2-amido-3-haloindoles with a C–N chiral axis are delivered using this strategy. The C3 halogen atoms can facilitate further transformation. Various functionalities, such as carbonyl, phosphine, aryl, and alkenyl groups, can be introduced into the C3 position of indoles. These structurally
Synthesis of 3,3-Dihalo-2-oxindoles from 2-Substituted Indoles <i>via</i>
Halogenation-Decarboxylation/Desulfonamidation-Oxidation Process
作者:Xiaojian Jiang、Feng Zhang、Junjie Yang、Pei Yu、Peng Yi、Yewei Sun、Yuqiang Wang
DOI:10.1002/adsc.201600771
日期:2016.12.22
A novel one‐pot reaction which combines halogenation, decarboxylation/desulfonamidation with oxidation has been developed. Diverse valuable 3,3‐dihalo‐2‐oxindole compounds can be produced rapidly and safely with isolated yields of up to 98% under mild conditions.
Synthesis of 3,3-dichloro-2-oxindoles from isatin-3-p-tosylhydrazones and (dichloroiodo)benzene
作者:Charlotte Hepples、Graham K. Murphy
DOI:10.1016/j.tetlet.2015.06.063
日期:2015.8
Lewis base-catalyzed chlorination reaction that employs the hypervalent chlorinating agent PhICl2. The discovery of p-tosylhydrazones as chlorination precursors has expanded the functional group tolerance of the chlorination reaction to now include carbamates, acetamides, and sulfonates. Additionally, this allowed us to circumvent the use of the diazo group in our chlorination reaction, and offers
The treatment of 1-methylindole-2,3-dicarboxylic acid with hypervalentiodine(III) reagent, phenyliodine diacetate (PI-DA), in the presence of lithium bromide gave 1-methyl-3,3-dibromooxindole. However, the reaction of 1-(phenylsulfonyl)indole-2,3-dicarboxylic acid with PIDA in the presence of lithium bromide afforded 2,3-dibromo-1-(phenylsulfonyl)indole. In a similar manner, the 2,3-dichloro- and
An efficient KI-mediated chloro-oxidation of indoles was developed, using KCl/NaCl as the chlorine source and oxone as oxidant, which affording various functionalized 3,3-dichloro-2-oxindoles in moderate to excellent yields. This chlorine gas-free protocol provided a practical approach for the synthesis of a series of 3-chloro-2-oxindole derivatives.
开发了一种高效的 KI 介导的吲哚氯氧化反应,使用 KCl/NaCl 作为氯源,oxone 作为氧化剂,以中等到极好的收率提供各种功能化的 3,3-二氯-2-oxindoles。这种不含氯气的方案为合成一系列 3-chloro-2-oxindole 衍生物提供了一种实用的方法。