Abstract
Two sequential metal-catalyzed transformations, involving [In]-catalyzed Friedel–Crafts type addition of spiroaminol carbon to indole C3 followed by [Rh]-catalyzed dehydrogenative cyclization of the resulting γ-amino alcohol culminated in the construction of the central tricyclic core isatisine A. The overall strategy employed three easily available starting compounds and delivered the complex tricyclic core in four steps—with all four steps being catalytic in nature.
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