SYNTHESIS OF MACROCYCLIC LACTONES APPLYING INTRAMOLECULAR 1,3-DIPOLAR CYCLOADDITION: SYNTHESIS OF (±)-A26771B

Abstract
The intramolecular 1,3-dipolar cycloaddition of the nitrile oxides derived from ω-nitroalkyl acrylates gave isoxazoline fused macrocyclic lactones. The direction of 1,3-dipolar cycloaddition is strongly affected by the ring size of forming lactones. Utilizing this method, total synthesis of (±)-A26771B was achieved.