Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 18, Issue 49, Pages 15816-15821Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201202672
Keywords
alkenylation; amination; C-H activation; cyclization; palladium; phenanthridines
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Funding
- National Basic Research Program of China [2011CB936003]
- Natural Science Foundation of China [21072169]
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A new protocol for the palladium-catalyzed free-amine-directed alkenylation of C(sp2)?H bonds and cycloamination is described. Substituted biaryl-2-amines react with various alkenes, including electron-deficient alkenes, aryl alkenes and alkyl alkenes, to give the corresponding phenanthridines with exclusive regioselectivity. The use of a-branched styrenes leads to the formation of tricyclic compounds with a seven-membered amine ring. The method operates through a free-amine-directed alkenylation and a subsequent hydroamination cyclization reaction.
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