Furan as a 1,3-diketone equivalent: the second type furan recyclization applied to indole synthesis
摘要:
A new approach for the synthesis of indole derivatives based on protolytic recyclization of 2-alkyl-5-(2-tosylaminoaryl)-furans is described. The furan ring in this unusual transformation formally serves as a 1,3-diketone equivalent. (c) 2006 Elsevier Ltd. All rights reserved.
A simple and effective method has been elaborated for the synthesis of thieno[2,3- B]indole ringsystem. It is based on the electrophilic recyclization of 2-alkyl-5-(2-isothiocyanoaryl)furans in the presence of anhydrous AlCl 3 .
on the acid-catalyzed recyclization of N-[2-(5-alkyl-2-furyl)phenyl]-2-aminoacetamides and permits the formation of both diazepine and pyrrole rings in one pot. The reaction proceeds via furanringopening to give the diketone moiety followed by consecutive reactions of the free amino group with both carbonyl functions. furans-ringopening-ringclosure- fused-ring system - pyrrolo[1,2-d][1,4]benzodiazepines
描述了一种合成吡咯并[1,2- d ] [1,4]苯并二氮杂的新方法。该方法基于N- [2-(5-烷基-2-呋喃基)苯基] -2-氨基乙酰胺的酸催化再循环,并允许在一锅中同时形成二氮杂和吡咯环。该反应通过呋喃开环进行以得到二酮部分,随后是具有两个羰基官能团的游离氨基的连续反应。 呋喃-开环-闭环-稠环系统-吡咯并[1,2- d ] [1,4]苯并二氮杂卓-Paal-Knorr反应
Furan Ring-Opening/Indole Ring-Closure: Pictet-Spengler-Like Reaction of 2-(<i>o</i>-Aminophenyl)furans with Aldehydes
作者:Alexander V. Butin、Maxim G. Uchuskin、Arkady S. Pilipenko、Fatima A. Tsiunchik、Dmitry A. Cheshkov、Igor V. Trushkov
DOI:10.1002/ejoc.200901241
日期:2010.2
new simple approach to 3-(2-acylvinyl)-2-(hetero)aryl-indoles has been developed. The method is based on the acid-catalysed interaction of 2-(2-aminophenyl)furans with (hetero)aromatic aldehydes. The reactions proceed under very mild conditions and lead to indoles containing a reactive α,β-unsaturated ketone moiety, which is suitable for further transformations, in moderate to good yields.
Oxidative Transformation of 2-Furylanilines into Indolin-3-ones
作者:Ekaterina R. Nasibullina、Elena Y. Mendogralo、Anton A. Merkushev、Anton S. Makarov、Maxim G. Uchuskin
DOI:10.1021/acs.joc.4c00359
日期:2024.5.3
Oxidation of 2-furylaninlies with m-CPBA followed by treatment with a base provides access to functionalized indolin-3-ones. The designed oxidativetransformation utilizes an underassessed chemical behavior of furyl-containing amines to form a C–N bond via engaging a β-carbon atom of the furan core upon a ring-forming step, thereby providing an alternative disconnection toward nitrogen-containing heterocycles