The first totalsynthesis of (+)-gregatin E and a new totalsynthesis of (+)-gregatin B are described. Key features of our synthetic approach involve a palladium-catalyzed cyclization–methoxycarbonylation of optically active propargylic acetate and a Suzuki–Miyaura coupling or CuTC-mediated coupling reaction. The absolute configuration of (+)-gregatin E (5R,5′S) is proposed.