Diels–Alder cycloaddition reaction of unactivated 2-aza-1,3-dienes with dialkyl azodicarboxylates and heterocumulenes
Abstract
The first example is presented of a Diels–Alder cycloaddition of electronically neutral 2-aza-1,3-dienes using an electron-poor dienophile; the [4 + 2] cycloaddition reaction of 2-aza-1,3-dienes to heterocumulenes and carbon disulphide is also shown.