开发了一种可见光诱导的N-烷基-N-甲基丙烯酰基苯甲酰胺、2-芳基-N-丙烯酰基吲哚和N-甲基丙烯酰基-2-苯基苯并咪唑与异硒氰酸钾 (KSeCN) 的自由基级联硒氰化/环化反应。该反应以廉价的KSeCN作为硒氰化试剂,过硫酸钾作为氧化剂,2,4,6-三苯基吡咯鎓四氟硼酸盐作为相转移催化和光催化的双功能催化剂进行。含硒氰酸盐的异喹啉-1,3(2 H ,4 H )-二酮、吲哚并[2,1 -a ]异喹啉-6(5 H )-酮和苯并咪唑并[2,1- a ]异喹啉-的库6(5 H )-在室温、可见光和环境条件下以中等至优异的产率获得。重要的是,该方案具有反应条件温和、大规模合成、操作简单、产物衍生化、良好的官能团和杂环耐受性等特点。
Metal-Free Cascade Methylation/Cyclization of N-Alkyl-N-methacryloylbenzamides with Dicumyl Peroxide
作者:Yan-Ning Niu、Xiao-Feng Xia、Yuan Yuan
DOI:10.1055/s-0036-1591522
日期:2018.3
A metal-free radical cascade methylation/cyclization of a wide range of N -alkyl- N -methacryloylbenzamides by using dicumylperoxide as the methylating reagent provides a convenient access to a series of methylated isoquinoline-1,3-diones in moderate yields.
Synthesis of oxindoles through trifluoromethylation of <i>N</i>-aryl acrylamides by photoredox catalysis
作者:Maojian Lu、Zhiji Liu、Jinwang Zhang、Yu Tian、Honggui Qin、Mingqiang Huang、Shirong Hu、Shunyou Cai
DOI:10.1039/c8ob01922c
日期:——
Mild and direct intramolecular oxidative aryltrifluoromethylations of activated alkenes have been established through visible light photocatalysis, affording a range of CF3-containing oxindoles or isoquinolinediones in the presence of an organic fluorophore-type photocatalyst 4CzIPN, oxygen and visible light irradiation under strong oxidant and transition metal free conditions. A variety of frequently
Electrochemical trifluoromethylation/cyclization for the synthesis of isoquinoline-1,3-diones and oxindoles
作者:Yuanqiang Guo、Ruiguo Wang、Hongjian Song、Yuxiu Liu、Qingmin Wang
DOI:10.1039/d1cc03389a
日期:——
reduction to generate trifluoromethyl radicals. The trifluoromethylation reagent (IMDN-SO2CF3) used in this strategy is inexpensive and easy to obtain, and the reaction can be conducted efficiently without the addition of additional redox reagents. Using this strategy, we achieved electrochemical trifluoromethylation/cyclization for the synthesis of isoquinoline-1,3-diones and oxindoles. This protocol
Cascade alkylarylation of substituted <i>N</i>-allylbenzamides for the construction of dihydroisoquinolin-1(2<i>H</i>)-ones and isoquinoline-1,3(2<i>H</i>,4<i>H</i>)-diones
作者:Ping Qian、Bingnan Du、Wei Jiao、Haibo Mei、Jianlin Han、Yi Pan
DOI:10.3762/bjoc.12.32
日期:——
An oxidative reaction for the synthesis of 4-alkyl-substituted dihydroisoquinolin-1(2H)-ones with N-allylbenzamide derivatives as starting materials has been developed. The radical alkylarylation reaction proceeds through a sequence of alkylation and intramolecular cyclization. The substituent on the C-C double bond was found to play a key role for the progress of the reaction to give the expected