Journal
EUROPEAN JOURNAL OF ORGANIC CHEMISTRY
Volume 26, Issue 1, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ejoc.202201109
Keywords
2H-Azirine; ring expansion; Regioselectivity; Formal [4+2] Cyclization; Formal [4+3] Cyclization
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A zinc-mediated cascade ring-opening cyclization of 2H-azirines and enolized-o-alkenylquinoline carbaldehydes for the synthesis of naphthyridine and azepine skeletons has been reported. The regioselectivity of the reaction can be switched from a seven- to a six-membered ring by shifting from two- to monosubstituted 2H-azirine. This transformation involves the construction of two C=C and C=N double bonds. This study describes the 2H-azirine-dependent cascade annulation in formal [4+3] and [4+2] cyclization reactions.
A zinc-mediated cascade ring-opening cyclization of 2H-azirines and enolized-o-alkenylquinoline carbaldehydes for the synthesis of naphthyridine and azepine skeletons has been disclosed. The regioselectivity of the reaction can be switched from a seven- to a six-membered ring by shifting from two- to monosubstituted 2H-azirine. This transformation involves the construction of two C=C and C=N double bonds. This report describes 2H-azirine-dependent cascade annulation in formal [4+3], and [4+2] cyclization reactions.
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