Mesoionic 1,3-oxazolium-5-olates (manchnones) react with thiocoumarins having an electron-withdrawing group at the 3-position to afford stereodefined fused polycyclic thienopyrroles. The reaction sequence seems to be triggered by a regiospecific dipolar cycloaddition followed by ring opening of the initial 1:1 cycloadduct and intramolecular rearrangement with an unusual ring contraction.
Stereodefined ring contraction-rearrangement of thiocoumarins to new fused benzo[b]thiophene derivatives
CORDARO, Massimiliano;GRASSI, Giovanni;RISITANO, Francesco;SCALA, ANGELA
2011-01-01
Abstract
Mesoionic 1,3-oxazolium-5-olates (manchnones) react with thiocoumarins having an electron-withdrawing group at the 3-position to afford stereodefined fused polycyclic thienopyrroles. The reaction sequence seems to be triggered by a regiospecific dipolar cycloaddition followed by ring opening of the initial 1:1 cycloadduct and intramolecular rearrangement with an unusual ring contraction.File in questo prodotto:
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