Base-promoted formal [4 + 1+1] annulation of aldehyde, N -benzyl amidine and DMSO toward 2,4,6-triaryl pyrimidines
摘要:
A base-promoted formal [4 + 1+1] annulation of aldehyde, N-benzyl amidine and DMSO was developed, leading to a series of 2,4,6-triaryl pyrimidines in moderate to good yields. Notably, DMSO served as a methine source, which was activated by base rather than either Lewis acid or electrophile. Molecular O-2 was the sole eco-friendly oxidant during this procedure. (C) 2017 Published by Elsevier Ltd.
Transition-metal-free selective pyrimidines and pyridines formation from aromatic ketones, aldehydes and ammonium salts
作者:Jinjin Chen、Huanxin Meng、Feng Zhang、Fuhong Xiao、Guo-Jun Deng
DOI:10.1039/c9gc02077b
日期:——
An efficient synthesis of pyrimidines and pyridines has been developed from readily available aromaticketones, aldehydes and ammonium salts under transition-metal-free conditions. In this strategy, ammonium salts were used as nitrogen sources and only water was generated as a nontoxic byproduct. A catalytic amount of NaIO4 played an important role in the selectivity control, whereas substituted pyridines
Base-Mediated Three-Component Tandem Reactions for the Synthesis of Multisubstituted Pyrimidines
作者:Dongqing Liu、Wei Guo、Wanqing Wu、Huanfeng Jiang
DOI:10.1021/acs.joc.7b02113
日期:2017.12.15
A base-mediated three-component tandem reaction for the synthesis of multisubstituted pyrimidines from amidines, aryl alkynes, and aldehydes in a one-pot manner has been developed. Advantages of this transformation include being transition-metal-free, high efficiency, available starting materials, and being environmentally friendly.
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
KO Bu-mediated transition-metal-free synthesis of pyrimidines by selective three-component coupling reactions: A mechanistic insight
作者:Fei Wang、Zhiwen Deng、Yawen Wang、Fanshu Yuan、Xing Zhang、Guo-Ping Lu、Ninghua Fu、Yamei Lin
DOI:10.1016/j.tet.2022.132985
日期:2022.9
A KOtBu-mediated strategy for pyrimidine synthesis via selective three-componentcouplingreactions has been disclosed. This chemistry, in which a series of pyrimidines (20 examples) can be prepared with moderate to excellent yields, has high potential for large-scale operation owing to its metal-free conditions, atom and step economy. According to mechanistic studies, oxidative species can be generated
已经公开了一种通过选择性三组分偶联反应合成嘧啶的 KO t Bu 介导的策略。这种化学可以以中等至优异的产率制备一系列嘧啶(20 个实例),由于其无金属条件、原子和步骤经济性,具有大规模操作的巨大潜力。根据机理研究,在空气存在下,KO t Bu 或甲苯可以生成氧化物质,这可以引发醇氧化成醛(或酮)。同时,KO t Bu 不仅促进了缩合环化过程,还引发了二氢嘧啶环的脱氢。