The B(C6F5)3-catalyzed oxidativedeamination/cyclization cascade reaction of benzylamines and ketones for the construction of 2,4,6-triarylpyridines under metal-/solvent-free conditions has been successfully achieved. The advantages of this strategy include good functional group tolerance, low catalyst loading and high yields.
已成功实现了B(C 6 F 5)3催化的苄胺和酮的氧化脱氨基/环化级联反应,用于在无金属/无溶剂条件下构建2,4,6-三芳基吡啶。该策略的优点包括良好的官能团耐受性,低催化剂负载量和高收率。
Metal-Free Synthesis of 2,4,6-Trisubstituted Pyridines via Iodine-Initiated Reaction of Methyl Aryl Ketones with Amines under Neat Heating
作者:Ze Zhang、Hui Xu、Ji-Chao Zeng、Fang-Jian Wang
DOI:10.1055/s-0036-1588380
日期:——
HI-catalyzed) condensation of methyl aryl ketones with amines and the following cyclization-aerobic oxidation. Large-scale synthesis and mechanistic investigation were also performed. A neat heating protocol has been developed for metal-free synthesis of various 2,4,6-trisubstituted pyridines via iodine-initiated (in situ generated HI-catalyzed) condensation of methyl aryl ketones with amines and the following
Cationic organotin cluster [
<i>t</i>
‐Bu
<sub>2</sub>
Sn(OH)(H
<sub>2</sub>
O)]
<sub>2</sub>
<sup>2+</sup>
2OTf
<sup>−</sup>
‐catalyzed one‐pot three‐component syntheses of 5‐substituted 1
<i>H</i>
‐tetrazoles and 2,4,6‐triarylpyridines in water
作者:Hongshe Wang、Weixing Zhao、Juan Du、Fenyan Wei、Qi Chen、Xiaomei Wang
DOI:10.1002/aoc.5132
日期:2019.10
The cationicorganotincluster [t‐Bu2Sn(OH)(H2O)]22+2OTf− is easy to prepare and stable in air. The catalytic activity of [t‐Bu2Sn(OH)(H2O)]22+2OTf− as a neutralorganotin Lewis acid catalyst is probed through the one‐pot three‐component syntheses of 5‐substituted 1H‐tetrazoles from aldehydes, hydroxylamine hydrochloride and sodium azide, and of 2,4,6‐triarylpyridines from aromatic aldehydes, substituted
Retracted Article: An efficient one pot three-component synthesis of 2,4,6-triarylpyridines using triflimide as a metal-free catalyst under solvent-free conditions
作者:Hongshe Wang、Weixing Zhao、Juan Du、Fenyan Wei、Qi Chen、Xiaomei Wang
DOI:10.1039/c9ra00653b
日期:——
A simple and efficient protocol developed for onepot three-component synthesis of 2,4,6-triarylpyridines from aromatic aldehydes, substituted acetophenones and ammonium acetate using the versatile super Brønsted acid triflimide (HNTf2) as an effective catalyst is described. The reactions proceed well in the presence of 1 mol% of HNTf2 at 80 °C under solvent-free conditions and provide the corresponding
An efficient, green solvent-free protocol for the synthesis of 2,4,6-triarylpyridines using reusable heterogeneous activated Fuller’s earth catalyst
作者:Deelip S. Rekunge、Ishwari A. Kale、Ganesh U. Chaturbhuj
DOI:10.1007/s13738-018-1434-8
日期:2018.11
AbstractA simple, efficient, and green method of preparation for the synthesis of highly substitutedpyridines by multicomponent reaction of acetophenones, aldehydes, and ammonium acetate using activated Fuller’s earth as an effective and reusable heterogeneous catalyst is described. The advantages of the present protocol include simple procedure with an easy workup procedure, mild reaction conditions