A simple method for the synthesis of functionalized 6-aryl-6H-dibenzo[b,d]pyran derivatives from 3-nitro-2H chromenes

The one-pot synthesis of multi-substituted 6-aryl-6H-dibenzo[b,d]pyran derivatives was achieved via vinylogous Michael addition as the key step and domino reactions under mild reaction conditions, employing readily available α,α-dicyanoolefins and 3-nitro-2H-chromenes as substrates.