Km. Brummond et H. Wan, THE ALLENIC PAUSON-KHAND CYCLOADDITION - DEPENDENCE IN PI-BOND SELECTIVITY ON SUBSTRATE STRUCTURE, Tetrahedron letters, 39(9), 1998, pp. 931-934
Alkynyl allenes undergo intramolecular Pauson-Khand (P-K) cycloadditio
ns to provide functionalized alpha-methylene and 4-alkylidene cyclopen
tenones in good yields. These studies have demonstrated a dependence o
f the pi-bond selectivity of this cycloaddition on the substitution pa
ttern of the allene. (C) 1998 Elsevier Science Ltd. All rights reserve
d.