A hypervalent iodine-mediated spirocyclization of 2-(4-hydroxybenzamido)acrylates – unexpected formation of δ-spirolactones
作者:Christian Hempel、Nicole M. Weckenmann、C. Maichle-Moessmer、Boris J. Nachtsheim
DOI:10.1039/c2ob26815a
日期:——
On the way towards a new total synthesis of (S)-arogenate, a novel aryl-λ3-iodane-mediated oxidative spirocyclization of para-substituted phenol derivatives has been discovered. Starting from easy accessible 2-(4-hydroxybenzamido)acrylates we could construct spirocyclic lactams in up to 52% yield. Under alternative reaction conditions the same precursors underwent an unexpected oxidative spirocyclization yielding a novel δ-spirolactone in up to 70% yield.