Aza-Ruthena(II)-Bicyclo-[3.2.0]-Heptadiene: Key Intermediate for Ruthenaelectro(II/III/I)-Catalyzed Alkyne Annulations.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION(2020)
摘要
A ruthenium-catalyzed electrochemical dehydrogenative annulation reaction of imidazoles with alkynes has been established, enabling the preparation of various bridgehead N-fused [5,6]-bicyclic heteroarenes through regioselective electrochemical C-H/N-H annulation without chemical metal oxidants. Novel azaruthenabicyclo[3.2.0]heptadienes were fully characterized and identified as key intermediates. Mechanistic studies are suggestive of an oxidatively induced reductive elimination pathway within a ruthenium(II/III) regime.
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关键词
C-H activation,dehydrogenation,electrochemistry,nitrogen heterocycles,ruthenium
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