Y. Liao*, J. Smith, R. Fathi*, Z. Yang*
Org. Lett. 2005, 7, 2707.
Benzo[b]furan-3-carboxylic acid (2) was generated from 1 by forming three new bonds in one step via a PdII-mediated cascade carboxylative annulation. The proposed mechanism was supported by the observation of an unusual acetylation of 1 as a side reaction together with an 18O-labeling study.
