F. Bonadies et al., AN EASY APPROACH TO BUTENOLIDES BY HORNER-WADSWORTH-EMMONS OLEFINATION OF ALPHA-HYDROXY KETONES, Tetrahedron letters, 36(16), 1995, pp. 2839-2840
By treatment with stabilized lithium phosphonates in the presence of a
ctivated 4 Angstrom molecular sieves, unprotected a-hydroxy ketones 1
undergo a convenient Horner-Wadsworth-Emmons olefination to give direc
tly butenolides 3 as exclusive or predominant products.