The Pd(OAc)2/CuI system effectively catalyzes the coupling of 3-bromoquinolin-2(1H)-ones with a series of azoles to give 3-(heteroaryl)quinolin-2(1H)-ones in good yields.
C–H Amination of Purine Derivatives via Radical Oxidative Coupling
作者:Zheng Luo、Ziyang Jiang、Wei Jiang、Dongen Lin
DOI:10.1021/acs.joc.8b00066
日期:2018.4.6
An oxidative coupling reaction between purines and alkyl ethers/benzyl compounds was developed to synthesize a series of N9 alkylated purine derivatives using n-Bu4NI as a catalyst and t-BuOOH as an oxidant. This protocol uses commercially available, inexpensive catalysts and oxidants and has a wide range of substrates with a simple operation.
6-(Alkylamino)-9-benzyl-9H-purines. A new class of anticonvulsant agents
作者:James L. Kelley、Mark P. Krochmal、James A. Linn、Ed W. McLean、Francis E. Soroko
DOI:10.1021/jm00398a019
日期:1988.3
electroshock-induced seizures (MES) in rats. Most compounds were prepared in three steps from 5-amino-4,6-dichloropyrimidine or in two steps via alkylation of 6-chloropurine. Potent anticonvulsant activity against MES resided in compounds that contain a benzyl substituent at the 9-position of 6-(methylamino)- or 6-(dimethyl-amino)purine. Among commonly used agents for control of seizures, this type of structure represents
Visible light-induced direct alkylation of the purine C<sub>8</sub>–H bond with ethers
作者:Changtong Lu、Gary Histand、Dongen Lin
DOI:10.1039/d3ob00147d
日期:——
purine derivatives by ethers was developed using Eosin Y as the photocatalyst and t-BuOOH as the oxidant at roomtemperature. This method describes the coupling of the α-C of the ether to the C8 of purine. Of particular interest is that substrates include purines with various functional groups and even unprotected 9H-purines. The protocol provides an effective method for the synthesis of 8-alkylpurine derivatives
以曙红Y为光催化剂, t -BuOOH为氧化剂,室温下开发了一步可见光诱导的嘌呤衍生物C 8 -H键直接烷基化反应。该方法描述了醚的 α-C 与嘌呤的 C 8的偶联。特别令人感兴趣的是底物包括具有各种官能团的嘌呤,甚至是未保护的 9 H-嘌呤。该协议为合成具有高原子经济性和高区域选择性的 8-烷基嘌呤衍生物提供了一种有效的方法。
Direct Sulfenylation of the Purine C<sub>8</sub>–H Bond with Thiophenols
作者:Wei Jiang、Juanping Zhuge、Jianxiao Li、Gary Histand、Dongen Lin
DOI:10.1021/acs.joc.9b03115
日期:2020.2.21
The one-step copper-mediated regioselective formation of the C-8-S bond for purine derivatives with arylthiols was achieved using air as the green oxidant in the presence of 1.0 equiv of Na2CO3 and stoichiometric CuCl and 1,10-phenanthroline monohydrate. This method provides an economical, easy-to-handle, and effective method for the synthesis of 8-sulfenylpurine derivatives in moderate to excellent yields. The reaction is selective for C8 over C2 and C6. It also tolerates a free amine on the purine, and it has a wide substrate scope.