نتایج جستجو برای: multicomponent reaction mcrs

تعداد نتایج: 421477  

Sanny Vermaa Suman L. Jaina

Potassium tribromide wrapped around polyethylene glycol ({K+PEG400}Br3-) was easily prepared by two step reaction of PEG400 with KBr followed by the addition of molecular bromine to give PEG embedded potassium tribromide as a dark viscous oil. The synthesized material was found to be an efficient, cost effective, environmentally benig...

Journal: :Chemical communications 2013
Lei Li An Lv Xin-Xing Deng Fu-Sheng Du Zi-Chen Li

Passerini three-component reaction and multicomponent polymerization (MCP) were demonstrated to be facile methods for the preparation of photo-cleavable polymers, photo- and redox-dually cleavable polymers, as well as block copolymers.

Journal: :Organic & biomolecular chemistry 2012
Feng Pan Jian-Ming Chen Zhe Zhuang Yin-Zhi Fang Sean Xiao-An Zhang Wei-Wei Liao

The first tertiary amine-catalyzed multicomponent tandem Strecker-allylic-alkylation (SAA) reaction has been developed, which provides a facile access to functionalized α-amino nitriles, which could be readily converted into α-methylene-γ-butyrolactams.

Journal: :Ultrasonics sonochemistry 2012
Leila Zare Nosrat Ollah Mahmoodi Asieh Yahyazadeh Mohammad Nikpassand

The first ultrasound-promoted multicomponent synthesis of pyridazinones and phthalazinones from arenes, cyclic anhydrides and ArNHNH(2) in the presence of an efficient recyclable catalyst, [bmim]Br/AlCl(3), in high yield and short reaction time is reported.

Journal: :Chemical communications 2010
Arun K Ghosh Jorden Kass

We have developed a practical synthesis of unique nucleoside derivatives via TiCl(4) promoted multicomponent reaction of optically active dihydrofuran, ethyl pyruvate/glyoxylate, and a TMS protected nucleobase in a single-pot operation.

Journal: :Molecules 2010
Hassan Valizadeh Ashraf Fakhari

N-Methyl-3-acylpyrroles were synthesized via a multicomponent reaction of dimethylacetylene dicarboxylate (DMAD), N-methylhydroxylamine and acylchlorides in the presence of KHCO(3). For comparison both conventional and microwave protocols were examined in this procedure. The reaction is clean and gives the products in good to excellent yields under conventional heating conditions at 40 degrees ...

Journal: :Chemical communications 2013
Xuejian Li Yanyan Zhao Haijun Qu Zhenjun Mao Xufeng Lin

The first catalytic asymmetric pseudo five-component (AB(2)C(2) type) reaction is reported. A spirocyclic chiral phosphoric acid catalyzed one-pot multicomponent reaction of aromatic aldehydes, anilines and β-ketoesters and afforded highly functionalized enantioenriched tetrahydropyridines with high levels of stereocontrol.

Journal: :Organic & biomolecular chemistry 2014
Angelika E Schneider Tamara Beisel Andrej Shemet Georg Manolikakes

A highly efficient Bi(OTf)3-catalyzed multicomponent synthesis of arylglycines from readily available starting materials is described. The reaction proceeds under mild conditions and provides a general route to various N-protected arylglycines.

In this study, silica nanoparticles were used as support to prepare a new heterogeneous catalyst system for application in organic reactions. The reaction of silica nanoparticles with sodium 2-bromoethane-1-sulfonate resulted in the connection of a sulfonic acid group on the surface of silica nanoparticles (NSESA). The synthetic catalyst system was characterized using different microscopic and ...

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