Acid-catalyzed oxidative cross-coupling of acridans with silyl diazoenolates and a Rh-catalyzed rearrangement: two-step synthesis of γ-(9-acridanylidene)-β-keto esters

A MsOH-catalyzed oxidative cross-coupling of acridans and silyl diazoenolates and Rh₂(OAc)₄-catalyzed rearrangement of the resultant diazo products were described, providing γ-(9-acridanylidene)-β-keto esters in good yields.