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.
With this method, a series of CF3-containing aza-heterocycles with high selectivity were fabricated in moderate to good yields. Preliminary mechanisticstudies revealed that the exceptional transformation was originated from the synergistic effect of photogenerated electrons and holes. Density function theory (DFT) was adopted to understand the high selectivity of this photocatalytic chemical transformation
Palladium(0)-Catalyzed Alkylarylation of N-Alkyl-N-methacryloylbenzamides with Alkyl Iodides
作者:Xiao-Feng Xia、Lei Zhang、Zhiting Liu、Rongjie Wang、Yinting Jin
DOI:10.1055/s-0036-1591581
日期:2018.7
An efficient Pd(0)-catalyzed alkylarylation of N-alkyl-N-methacryloylbenzamides with alkyl iodides for the synthesis of isoquinoline-1,3-diones is described. A highlight of the method is its excellent functional-group tolerance. Mechanistic investigations suggest that a radical addition/cyclization process is probably involved in the sequences.
Metal-free visible-light-promoted thiocyanation/cyclization cascade for the synthesis of thiocyanato-containing isoquinolinediones
作者:Yu-Jue Chen、Yan-Hong He、Zhi Guan
DOI:10.1016/j.tet.2019.04.053
日期:2019.5
A visible-light induced metal-free thiocyanate radical addition/intramolecular cyclization cascade reaction for the synthesis of thiocyanato-containing isoquinolinediones from N-alkyl-N-methacryloylbenzamides is described. The organic dye 9-mesityl-10-methylacridinium perchlorate (Acr+-Mes ClO4−) is used as a photocatalyst, and cheap and readily available ammonium thiocyanate is used to provide thiocyanate