Journal
EUROPEAN JOURNAL OF ORGANIC CHEMISTRY
Volume 2019, Issue 48, Pages 7842-7856Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ejoc.201901512
Keywords
Meerwein arylation; Arenediazonium salts; Thiophene; Heterocycle synthesis; Thorpe-Ziegler cyclization
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2-Bromo-2-chloro-3-arylpropanenitriles can be prepared by Meerwein reaction from 2-chloroacrylonitrile and various aryldiazonium salts under copper(II) bromide catalysis. They proved to be stable compounds which form 2-chlorocinnnamonitriles upon treatment with bases. Reaction of the title compounds with substituted thioglycolates gave substituted 3-aminothiophenes which have not yet been accessible by other routes. Three-component reactions with the title compound, sodium sulfide and bromonitromethane, chloroacetonitrile, or ethyl 4-chloroacetoacetate gave 2-nitro- and 2-cyano-substituted 3-aminothiophenes, and thienopyridinediones in high yields and in one single step, respectively.
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