Electrocyclic ring opening of charged cis-bicyclo[3.2.0]heptadiene and heterocyclic derivatives. The anti-Woodward-Hoffmann quest (II).
The ring opening reactions of fused cyclobutenes have been the subject of mechanistic debate for decades. Some reports have been published recently suggesting that, in some heterocyclic derivatives, the disrotatory anti-Woodward-Hoffmann mechanism might be responsible for the ring opening. We hereby show that the conrotatory pathway is still the lowest energy alternative for all cases examined, including push-pull substituted 2-thia-4-azabicyclo[3.2.0]hepta-3,6-dienes. Actually, we found that the disrotatory transition state exchanges roles with a double-bond isomerization depending on the substituents around the bicyclic structure.
Silva López
Carlos
C
Departamento de Química Orgánica, Facultade de Química, Universidade de Vigo, Lagoas Marcosende, 36310, Vigo, Galicia, Spain. csilval@uvigo.es
Nieto Faza
Olalla
O
de Lera
Angel R
AR