2005 Hydroxycarboxylic acids (ether carboxylic acids) and esters P 0280 Diastereo- and Enantio-Selective Crotylation of α-Ketoesters Using Crotyl BoroAcid Ester Complexes. — Chiral crotylborates react with ethyl pyruvate highly 06- 071 nic diastereospecifically. By far, the best enantioselectivity is achieved with boronates (IV) and (V) based on diisopropyl tartrate. — (CHEN, Y.; ELTEPU, L.; WENTWORTH*, P. J.; Tetrahedron Lett. 45 (2004) 45, 8285-8288; Dep. Chem., Scripps Res. Inst., San Diego, La Jolla, CA 92037, USA; Eng.) — Mais
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