Highlyefficientasymmetricconjugateaddition of MeMgBr to α,β-unsaturatedesters catalyzed by CuI/Tol-BINAP, Paterson aldol, organocatalytic aldol, and cross-metathesis reactions were applied in the synthesis of C13-C23 fragment of Iriomoteolide-1a. asymmetricconjugateaddition - organocatalytic aldol - cross-metathesis - Iriomoteolide-1a