A three-component condensation reaction between 2-aminopyridine, an aldehyde and an isonitrile catalyzed by scandium triflate affords derivatives of 3-aminoimidazo[1,2-a]pyridine; aminopyrazine reacts similarly. A library of heterocycles, prepared in high yield by parallelsynthesis and purification on an ion-exchange resin, was subjected to further reactions at the amino group.
4-nitro-1-((trifluoromethyl)sulfonyl)-imidazole (NTSI), slight modifications of reaction conditions resulted in significantly different reaction paths to provide either nitriles or isonitriles. The challenging conversion of aldoximes into isonitriles was achieved under mild conditions.
New Method for the CombinatorialSearch of Multi Component Reactions
作者:Maxim A. Mironov、Vladimir S. Mokrushin、Sergey S. Maltsev
DOI:10.1055/s-2003-39298
日期:——
A novel method for the combinatorial finding of multi component reactions involving replacements of oligomerisation participants is introduced. Using this method the new three-component reaction between isoquinoline, gem-diactivated olefins and isocyanides leading to substituted 2,3-dihydro-10H-pyrrolo[2,1-a]isoquinoline-1-ones is described.
New catalytic system for the synthesis of imidazo[1,2-a]pyridines by the Ugi reaction
作者:M. A. Mironov、M. I. Tokareva、M. N. Ivantsova、V. S. Mokrushin
DOI:10.1007/s11172-006-0494-6
日期:2006.10
is proposed as an efficient catalyst for the preparation of a great variety of imidazo[1,2-a]pyridine derivatives by three-component condensation of aromatic isocyanides, aldehydes, and 2-aminopyridine. The advantages of this procedure are high yields of the target products and the absence of side reactions.
Ligands for Metals and Improved Metal-Catalyzed Processes Based Thereon
申请人:Buchwald L. Stephen
公开号:US20080033171A1
公开(公告)日:2008-02-07
One aspect of the present invention relates to novel ligands for transition metals. A second aspect of the present invention relates to the use of catalysts comprising these ligands in transition metal-catalyzed carbon-heteroatom and carbon-carbon bond-forming reactions. The subject methods provide improvements in many features of the transition metal-catalyzed reactions, including the range of suitable substrates, reaction conditions, and efficiency.