Appeal No. 95-3156
Application No. 07/898,348
wherein R is H, trialkylsilyl, triarylsilyl, diarylalkylsilyl
1
or aryldialkylsilyl, wherein the alkyl portions of said groups
contain 1-4 carbon atoms, and the aryl portions of said groups
are selected from the group consisting of phenyl,
p-nitrobenzylcarbonate or phenyl substituted with one to three
groups selected from C to C alkyl, halo, trifluoromethyl,1 3
amino, cyano and nitro;
R represents C alkyl, C alkenyl, phenyl, phenyl4 1-4 2-4
substituted by one to three groups selected from C to C1 3
alkyl, halo, trifluoromethyl, amino, cyano and nitro,
with a silyl
enolether of the formula:
wherein:
R and R are independently H, C to C alkyl, C to C2 3 1 4 2 4
alkenyl, benzyl or phenethyl; and
R represents benzyl, allyl, C alkyl, or p-nitrobenzyl,5 1-4
in the presence of a Lewis acid selected from the group
consisting of zinc halide, boron trifluoride etherate,
titanium tetra-chloride, stannic chloride and aluminum
chloride
-4-
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Last modified: November 3, 2007