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Four cobalt‐catalyzed oxidative annulation reactions of nitrogen‐containing arenes with alkynes proceeds by C−H activation, thus leading to biologically useful quaternary ammonium salts, including pyridoisoquinolinium, cinnolinium, isoquinolinium, and quinolizinium salts, in high yields. The results are comparable to those reactions catalyzed by rhodium and ruthenium complexes. The transformation...
Salz in der Suppe: Die Titelreaktion liefert hoch substituierte Isochinoliniumsalze (siehe Schema; Cp*=Me5C5), und zwar über eine C‐H‐Aktivierung mit anschließender Anellierung in Gegenwart eines Rhodiumkatalysators. Der Reaktionsmechanismus wird diskutiert, ebenso wie eine Anwendung zur Synthese des Naturstoffs Oxychelerythrin.
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