AgNO2 as the NO Source for the Synthesis of Substituted Pyrazole N-Oxides from N-Propargylamines
摘要:
A straightforward method for synthesizing the pyrazole N-oxides from N-propargylamines and AgNO2, through oxidation/cyclization reaction had been developed. AgNO2, was used as the NO source for the first time to synthesize pyrazole N-oxides. Various substituted groups on N-propargylamines proceeded smoothly, and the desired products were obtained in good yields.
Ln[N(SiMe<sub>3</sub>)<sub>2</sub>]<sub>3</sub>-Catalyzed Cross-Diinsertion of CN/CC into an NH Bond: Facile Synthesis of 1,2,4-Trisubstituted Imidazoles from Propargylamines and Nitriles
A lanthanide‐catalyzed sequential insertion of CN and CC into an NHbond is presented. The convenient reaction, which proceeds under mild conditions, is an efficient method for preparing 1,2,4‐trisubstituted imidazoles directly from readily available propargylamines and nitriles.
Mild and efficient synthesis of propargylamines by copper-catalyzed Mannich reaction
作者:Lothar W. Bieber、Margarete F. da Silva
DOI:10.1016/j.tetlet.2004.09.079
日期:2004.11
Terminal alkynes undergo mild and efficient aminomethylation with aqueous formaldehyde and secondary amines under CuI catalysis. In most cases high to nearly quantitative yields of tertiary propargylamines are obtained in DMSO solution at room temperature. Aromatic, aliphatic and silylated acetylenes as well as alkynols can be used. Primary amines are less reactive and satisfactory yields of secondary propargylamines
20‐tetra(4‐pyridyl)porphyrin (TPyP‐H2) ligands to afford a robust 2D metal–organic framework (Ag27‐MOF). This silver cluster‐assembled material serves as a highly efficient heterogeneous catalyst for the cyclization of both terminal and internal propargylamines with CO2 under atmospheric pressure. Density functional theory (DFT) calculations illustrate that the high catalytic activity and broad substrate
A new, heterogeneous, 4 Å molecular sieve-supported copper(II) catalyst was developed and was used successfully in the A3 coupling of alkynes, aldehydes and amines under simple reaction conditions.
我们开发了一种新型、异质、4 Å 分子筛支撑的铜(II)催化剂,并在简单的反应条件下成功用于炔、醛和胺的 A3 偶联反应。
Stereoselective Synthesis of New Selenium-Containing Heterocycles by Cyclocarbonylation of Aminoalkynes with Carbon Monoxide and Selenium
The reaction of 3-aminoalkynes 2 with carbon monoxide and selenium yielded 5-alkylideneselenazolin-2-ones 3 stereoselectively via cycloaddition of in situ generated carbamoselenoates to the carbon-carbon triple bond. 4-Aminoalkyne 7 also afforded the corresponding six-membered selenium-containing heterocycle with the aid of CuI.