N-Heterocycles by Cyclization of 2′-Nhr-Chalcones, 2′ -Nhr-Chalcone Dibromides and 2′-Nhr-α-Azidochalcones
摘要:
Syntheses of six-membered N-heterocycles from 2'-NHR--chalcones, 2'-NHR-chalcone dibromides and 2'-NHR-alpha-azidochalcones are described and discussed.
An iridium-catalyzed annulation of chalcones with sulfonylazides via cascade C–H amidation and intramolecular aza-Michael addition was developed, affording a variety of 2-aryl-2,3-dihydro-4-quinolones in moderate to good yields. This reaction features easy operation, readily available starting materials, and the cascade formation of two C–N bonds in one pot.