一种制备2-(4 H -3,1-苯并噻嗪-4-基)乙酸衍生物和2-(2-硫代-1,2,3,4-四氢喹唑啉-4-基)乙酸的有效方法衍生物已经开发出来。3-(2-异硫氰酸根合苯基)丙酸衍生物与仲胺在室温下在甲醇中的反应生成相应的硫脲中间体,该中间体在回流温度下加热时,由于硫原子对1,4的丙烯部分的攻击而环化-addition方式,得到2-(2-二烷基氨基-4- ħ -3,1-苯并噻嗪-4-基)乙酸衍生物以一锅煮的。使用伯胺代替仲胺的类似序列提供了2- [3-烷基(或芳基)-2-硫代-1,2,3,4-四氢喹唑啉-4-基]乙酸衍生物。 4 H -3,1-苯并噻嗪-2-硫代-1,2,3,4-四氢喹唑啉-3-(2-异硫氰酸根合苯基)丙酸-硫脲-1,4-加成
Silver-Catalyzed Cross-Coupling of Isocyanides and Active Methylene Compounds by a Radical Process
作者:Jianquan Liu、Zhenhua Liu、Peiqiu Liao、Lin Zhang、Tao Tu、Xihe Bi
DOI:10.1002/anie.201504254
日期:2015.9.1
Isocyanides are versatile building blocks, and have been extensively exploited in CH functionalization reactions. However, transition‐metal‐catalyzed direct CH functionalization reactions with isocyanides suffer from over‐insertion of isocyanides. Reported herein is a radical coupling/isomerization strategy for the cross‐coupling of isocyanides with activemethylenecompounds through silver‐catalysis
Photoredox Catalysis toward 2-Sulfenylindole Synthesis through a Radical Cascade Process
作者:Marilia S. Santos、Hugo L. I. Betim、Camila M. Kisukuri、Jose Antonio Campos Delgado、Arlene G. Corrêa、Márcio W. Paixão
DOI:10.1021/acs.orglett.0c01297
日期:2020.6.5
A radicalcascade process initiated through visible-light induced thiyl radical coupling with ortho-substituted arylisocianides followed by an intramolecular cyclization and subsequent aromatization to access 2-sulfenylindoles is described. The key thiyl radicals are promptly generated via a hydrogenatomtransfer event. The redox-neutral protocol features broad substrate scope, excellent functional
Palladium-catalyzed Decarboxylative [4+1] Cyclization of γ-Methylidene-δ-valerolactones with Isocyanides
作者:Soyoung Park、Ryo Shintani、Tamio Hayashi
DOI:10.1246/cl.2009.204
日期:2009.3.5
A palladium-catalyzed decarboxylative cyclization of γ-methylidene-δ-valerolactones with isocyanides has been developed to afford conjugated cyclopentenimines under mild conditions. Some preliminary results toward the development of an asymmetric variant have also been described.
A new furoketenimine intermediate from the coupling of ene-yne-ketones and o-alkenyl arylisocyanides, which enables the efficient synthesis of a wide range of tetracyclic and pentacyclic furan-fused heterocycles in a one-pot dominoprocess under catalyst-free conditions, is disclosed. Based on the control experiments, a cascade of 1,6-addition, cyclization, intramolecular Diels–Alder reaction, and
A new formal [1 + 2 + 3] annulation of o-alkenyl arylisocyanides with α, β-unsaturatedketones under metal-, base-, and acid-free conditions is disclosed. This domino reaction provides a general protocol for the efficient and practical synthesis of a wide range of carbazole derivatives from readily available starting materials in a single operation. Furthermore, this methodology was used as the key