Acess to Polyfunctionalized Carbazoles through π-Extension of 2-Methyl-3-oxoacetate Indoles

Formal [4+2] annulation of 2-methyl-3-oxoacetate indoles with naphthalene-1,4-dione and dialkyl acetylene dicarboxylates has been successfully developed. A structurally diverse set of polyfunctionalized carbazoles was efficiently constructed in acceptable to excellent yields. This reaction features H2O as only by-product, a broad substrate scope, and proceeds under mild conditions.