Novel enantioselective acylating agents. The reactions of chiral ortho esters and silylenol ethers as a route to optically active monoprotected 1,3-dicarbonyl compounds
A novelenantioselectiveroute to monoprotected 2-substituted-1,3-dicarbonyl compounds has been developed via acylation of silylenolethers with chiralorthoesters derived from diethyl or di-isopropyl (R,R)-tartrates; good yields and stereoselectivity can be achieved starting from cyclic enolsilanes.