We herein report a copper-catalyzed formal [5 + 2] aza-annulation
of N-fluorosulfonamides and 1,3-dienes/1,3-enynes
for synthesis of structurally diverse alkene/alkyne-containing azepanes.
The reaction features selective functionalization of distal unactivated
C(sp3)–H bonds and a broad substrate scope, thus
allowing the late-stage modification of pharmaceuticals and natural
products. A radical mechanism involving 1,5-hydrogen atom transfer
of N-radicals, facile coupling of alkyl radicals with 1,3-dienes/1,3-enynes,
and the construction of azepane motifs via C–N bond formation
is proposed.
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