The asymmetric catalytic aldol reaction of silyl allenolates with aldehydes
has been achieved by using N-C3F7CO oxazaborolidine as the catalyst. The f
luoroacyl group of the catalyst was found to be crucial for control of enan
tioselectivity. The reaction provides the first enantioselective approach t
o beta -halo Baylis-Hillman-type adducts.