The titled Claisen modification is shown to proceed with a remarkably high level of diastereoselection and asymmetric transmission by virtue of the proper choice of the combination of the silyl triflate and the tertiary amine used.
The Claisenrearrangement of esterenolates with appropriate metal ions bearing bulky cyclopentadienyl ligands was found to proceed through a boat-like transition state leading to the products with the different configuration from that expected from a chair-like transition state.