Halonium-Initiated C–O Bond Formation via Umpolung of α-Carbon to the Carbonyl: Efficient Access to 5-Amino-3(2H)-furanones
摘要:
Highly efficient C-O bond formation has been developed via carboxylic acid catalyzed reaction of 1-acetylcyclopropanecarboxamides with N-halosuccinimide (NXS), which provides strategically novel and atom-economic access to biologically important 5-amino-3(2H)-furanones. The mechanism of halonium-initiated tandem oxa-cyclization and ring opening of cyclopropane was proposed. A variety of nucleophiles were found to open the cyclopropane.
Synthesis of spiro[isoquinolinone-4,2′-oxiranes] and isoindolinones via a multicomponent reaction of 2-acetyl-oxirane-2-carboxamides, arylaldehydes and malononitrile
Efficient synthesis of spiro[isoquinolinone-4,2â²-oxiranes] was achieved based on a multicomponent one-pot reaction of readily available cis-2-acetyl-oxirane-2-carboxamides, arylaldehydes and malononitrile at room temperature. However, in the reaction with trans-2-acetyl-oxirane-2-carboxamide substrates, 3-iminoisoindolinones were obtained in moderate to high yields.
Substrate- and base-dependent reactivities of acylketene toward aryl aldimines derived from 2-amino-4-methylpyridine
作者:Nuket Ocal、Necla Mor、Ihsan Erden
DOI:10.1016/j.tetlet.2015.09.157
日期:2015.11
Acylketene, generated from 2,2,6-trimethyl-4H-1,3-dioxin-4-one reacts with aryl aldimines derived from 4-methyl-2-aminopyridine to give a variety of products, depending on the substituent on the C-aryl group, base used, and hydrolytic stability of the starting aldimine. Also the presence of the N-(2-pyridyl) group plays an important role in the fate of the reaction course, frequently participating in intramolecular conjugate additions, giving rise to interesting heterocycles. (C) 2015 Elsevier Ltd. All rights reserved.
Halonium-Initiated C–O Bond Formation via Umpolung of α-Carbon to the Carbonyl: Efficient Access to 5-Amino-3(2<i>H</i>)-furanones
Highly efficient C-O bond formation has been developed via carboxylic acid catalyzed reaction of 1-acetylcyclopropanecarboxamides with N-halosuccinimide (NXS), which provides strategically novel and atom-economic access to biologically important 5-amino-3(2H)-furanones. The mechanism of halonium-initiated tandem oxa-cyclization and ring opening of cyclopropane was proposed. A variety of nucleophiles were found to open the cyclopropane.