The alkylation of ethyl (S)- and (R)-4,5-epoxy-2-pentenoates (11) and
(12), chiral terminal gamma,delta-epoxy acrylates prepared from D-mann
itol, by trialkylaluminum in the presence of water occurs regioselecti
vely at the gamma position, i.e., at the internal position, to yield a
sole product respectively with net inversion of configuration. The me
thod provides useful chiral synthons for natural product synthesis. (C
) 1997 Elsevier Science Ltd.