Large-scale synthesis of the anti-cancer marine natural product (+)-discodermolide. Part 2: Synthesis of fragments C1-6 and C9-14

Kilogram-scale syntheses of fragments C1-6 (6) and C9-14 (4) of (+)-discodermolide from common precursor 3 are described. Improved procedures for each step of both fragments were developed by minimizing or eliminating the formation of byproducts that were isolated and characterized in Smith's synthesis.