2(3H)-oxazolones from α-hydroxy amides and keteneylidenetriphenylphosphorane via a phoshorus ylide cascade

Article abstract of DOI:10.1002/jlac.199719970132

Upon heating in xylene α-hydroxyamides 3 react with the cumulated phosphorus ylide 1 to give the substituted 2(3H)-oxazolones 8 in 40-80% yield. The reaction proceeds via an addition/cyclization/intermolecular-Wittig olefination sequence, which implies th