An asymmetric synthesis of syringolide 1, one of the elicitors produced by Pseudomonas syringae pv. tomato, is described. It was synthesized from 2-(1-oxoethyl)-2-buten-4-olide via 1,4-addition of alkenyl cuprate, asymmetric dihydroxylation, and intramoleculr Michael reaction. (C) 1997 Elsevier Science Ltd.