Efficient and Benign One-Pot Conversion of N-Tosyl-1,4,5,6-tetrahydropyrimidines to Pyrimidines via Tandem β-Elimination and Aromatization
摘要:
An efficient, mild, benign, and practical method for one-pot conversion of N-tosyl-1,4,5,6-tetrahydropyrimidines into pyrimidines is discussed in detail. In this method, N-tosyl-1,4,5,6-tetrahydropyrimidines are first prepared via N-tosylation of tetrahydropyrimidines with TsCl and then treated with 1.5 equivalents of NaOH in dimethylsulfoxide (DMSO) under air at 60 degrees C to afford corresponding pyrimidines in 70-95% yields via cascade -elimination and aromatization. [Supplementary materials are available for this article. Go to the publisher's online edition of Synthetic Communications (R) for the following free supplemental resources: Full experimental and spectral details.]
A convergent synthesis of a pyrimidine core has been achieved. Treatment of alpha,alpha-dibromo oxime ethers, which are easily derived from the corresponding esters, with a variety of Grignardreagents provides trisubstituted pyrimidines in good yields. This new method offers an easy access to functionalized pyrimidines.
A new method for the preparation of pyrimidines by condensation of β-dicarbonyl compounds, ammonium salts and carbonyl containing substances has been developed.
开发了一种通过β-二羰基化合物,铵盐和含羰基物质缩合制备嘧啶的新方法。
Pyrimidine-Core Extended π-Systems: General Synthesis and Interesting Fluorescent Properties
作者:Kenichiro Itami、Daisuke Yamazaki、Jun-ichi Yoshida
DOI:10.1021/ja044923w
日期:2004.12.1
We have developed a simple but powerful synthetic strategy that permits the assembly of pi-systems onto a pyrimidine core in a programmable and diversity-oriented format. The nucleophilic addition of ArLi to 2-methylthiopyrimidine, followed by 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ) oxidation, resulted in the production of 4-aryl-2-methylthiopyrimidines. The iterative reaction sequence then
我们开发了一种简单但功能强大的合成策略,允许以可编程和面向多样性的格式将 pi 系统组装到嘧啶核上。ArLi 与 2-甲基硫代嘧啶的亲核加成,然后是 2,3-二氯-5,6-二氰基-1,4-苯醌 (DDQ) 氧化,产生 4-芳基-2-甲基硫代嘧啶。然后重复反应序列得到4,6-二芳基-2-甲基硫代嘧啶。在NiCl 2 (dppe)的催化作用下,所得加合物进一步与ArMgBr反应,得到2,4,6-三芳基嘧啶。通过遵循这种合成方案,有趣的嘧啶核 pi 系统以可编程方式快速构建。成功发现了许多有趣的荧光材料和特性(例如,
A Sustainable Multicomponent Pyrimidine Synthesis
作者:Nicklas Deibl、Kevin Ament、Rhett Kempe
DOI:10.1021/jacs.5b09510
日期:2015.10.14
fine chemicals is a central topic of sustainable synthesis. Multicomponent reactions are especially attractive in organic chemistry as they allow the synthesis of large libraries of diversely functionalized products in a short time when run in a combinatorial fashion. Herein, we report a novel, regioselective, iridium-catalyzed multicomponent synthesis of pyrimidines from amidines and up to three (different)
Acceptorless Dehydrogenative Synthesis of Pyrimidines from Alcohols and Amidines Catalyzed by Supported Platinum Nanoparticles
作者:Sharmin Sultana Poly、S. M. A. Hakim Siddiki、Abeda S. Touchy、Kah Wei Ting、Takashi Toyao、Zen Maeno、Yasuharu Kanda、Ken-ichi Shimizu
DOI:10.1021/acscatal.8b02814
日期:2018.12.7
Pt-catalyzed acceptorless dehydrogenation of the alcohol substrate, which is followed by sequential condensation, cyclization, and dehydrogenation. Measurements of the turnover frequency combined with the results of density functional theory calculations on different metal surfaces suggest that the adsorption energy of H on the Pt surface is optimal for the acceptorless dehydrogenation process, which causes