87877-82-5Relevant academic research and scientific papers
Intramolecular Nitrofuran Diels-Alder Reactions: Extremely Substituent-Tolerant Cycloadditions via Asynchronous Transition States
Cowie, Thomas Y.,Veguillas, Marcos,Rae, Robert L.,Rougé, Mathilde,Zurek, Justyna M.,Prentice, Andrew W.,Paterson, Martin J.,Bebbington, Magnus W. P.
, p. 6656 - 6670 (2017)
Nitrofurans undergo intramolecular Diels-Alder reactions with tethered electron-poor dienophiles more rapidly and in higher yield than non-nitrated furans. Computational studies indicate that increased stabilization of a partial positive charge on the nitro-substituted carbon in both transition state and product is the driving force for these reactions. Frontier molecular orbital energy differences indicate a switch from normal to inverse electron demand upon nitration. There does not appear to be a contribution from any differences in aromatic stabilization energy between furans and nitrofurans. Calculations show that the nitrofuran reactions proceed via a highly asynchronous transition state allowing easier bond formation between two sterically hindered carbons.
