A method for the totalsynthesis of naturally occurring 3-en-oyltetramic acids derived fromL-tyrosine is described, allowing for three chemical transformations to occur in one pot by using a multicomponent mixture. The sequence involves (1) a base-promoted Lacey―Dieckmann condensation, (2) a Michaelis―Becker reaction, and (3) a Wittig―Horner―Emmons reaction between the resulting 3-phosphonoacetyltetramic