The catalyticasymmetric total synthesis of (−)‐exiguolide, a complex 20‐membered macrolide embedded with a bis(tetrahydropyran) motif, is reported. The convergent synthesisinvolves the construction of the C1–C11 tetrahydropyran segment via catalyticasymmetric allylation and Prins cyclization, and the formation of the C12–C21 phosphonate segment via catalyticasymmetric cyclocondensation reaction