Co(II)‐Catalysed C−H/N−H Annulation of Cyclic Alkenes with Benzamides at Room Temperature: An Easy Access to the Core Skeleton of Hexahydrobenzo[c]phenanthridine‐type Alkaloids

Abstract We report a highly regio‐ and stereoselective synthesis of the core skeleton of hexahydrobenzo[ c ]phenanthridine‐type alkaloids at room temperature using Co(acac) 2 . The reaction is compatible for a wide range of substrates and also provides good to excellent yield of products.