Anil Synthesis in the Design of Push−Pull Systems. Synthesis of 2- and 4-(4-Styrylphenyl)-substituted Diphenylpyrimidines
摘要:
The potential of anil synthesis for the preparation of 2,4,6-triaryl-substituted pyrimidines with an extended chain of delocalized pi-bonds was studied. The reaction of (E)-3-phenyl-1-(p-tolyl)prop-2-en-1-one or chalcone with benzamidine, 4-methylbenzamidine, or 4-isobutoxybenzamidine hydrochlorides in ethanol in the presence of KOH gave 2,4-diphenyl-6-(p-tolyl)pyrimidine, 4,6-diphenyl-2-(p-tolyl)pyrimidine, and 2-(4-isobutoxyphenyl)-4-phenyl-6-(p-tolyl)pyrimidine. The synthesized pyrimidines were reacted with (E)-N-(phenyl- or 2-chlorophenyl)-1-arylmethanimines in DMF in the presence of a KOH/LiH mixture to obtain (E)-4,6-diphenyl-2-(4-styrylphenyl)pyrimidines and (E)-2,6-diphenyl-4-(4-styrylphenyl)pyrimidines were obtained.
DOI:
10.1134/s1070428020020153
作为产物:
描述:
2-(4-Methylphenyl)-4,6-diphenyl-1,2-dihydropyrimidine 在
Eosin Y 作用下,
以
二甲基亚砜 为溶剂,
以27.0 mg的产率得到4,6-diphenyl-2-(p-tolyl)pyrimidine
Mechanistic insight into the azo radical-promoted dehydrogenation of heteroarene towards N-heterocycles
作者:Amreen K. Bains、Debashis Adhikari
DOI:10.1039/d0cy01008a
日期:——
reactions to synthesize wide variety of N-heterocycles. In these processes, the dehydrogenation of saturated heteroarenes in the late stage is generally required to furnish the desired N-heterocycle. However, in a one-pot, multistep heterocycle synthesis, this step is not well elucidated, and the role of the catalyst is not thoroughly understood. Furthermore, the use of copious amount of base at elevated
Copper-catalyzed three-component synthesis of pyrimidines from amidines and alcohols
作者:Tianchao Shi、Feng Qin、Qian Li、Wu Zhang
DOI:10.1039/c8ob02694g
日期:——
An efficient copper-catalyzed one-pot three-component reaction of amidines, primary alcohols and secondary alcohols has been developed to synthesize multisubstituted pyrimidines. The significant merits of this method involve high atom efficiency, good functional group tolerance and operational simplicity.
Direct synthesis of 2,4,5-trisubstituted imidazoles and di/tri-substituted pyrimidines via cycloadditions of α,β-unsaturated ketones/aldehydes and N′-hydroxyl imidamides
作者:Ping Wu、Xueguo Zhang、Baohua Chen
DOI:10.1016/j.tetlet.2019.03.025
日期:2019.4
di/trisubstituted pyrimidines via iron-catalyzed cross-dehydrogenative coupling (CDC), with excellent tolerance and yields, has been developed. In this report, α,β-unsaturatedaldehydes/ketones and N′-hydroxyl imidamides undergo [3+2] and [3+3] cycloadditions in two processes, involving iron-mediated Michael reaction, Robinson Annulation and 1,5-electrocyclization.
Bioinspired Radical‐Mediated Transition‐Metal‐Free Synthesis of N‐Heterocycles under Visible Light
作者:Amreen K. Bains、Yadav Ankit、Debashis Adhikari
DOI:10.1002/cssc.202002161
日期:2021.1.7
extended to multi‐component, one‐pot coupling for the synthesis of quinoline and pyrimidine. This organocatalytic approach is very mild (70 °C, 8 h) compared to a multitude of transition‐metal catalysts that have been used to prepare these heterocycles. A detailed mechanistic study proves the intermediacy of the iminosemiquinonate‐type radical and a critical hydrogen atom transfer step to be involved