Synthetic Studies toward Phorboxazole A. Stereoselective Synthesis of the C28−C46 Side Chain Fragment

Abstract
A stereoselective synthesis of the C28−C46 fragment (3) of phorboxazole A is described. Key advances include an enantioselective allylation to establish the stereochemistry of the tetrahydropyran unit and a useful SmI2-mediated modification of the Barbier reaction of iodomethyloxazole 15 with aldehyde 14.