Synthesis of a C4-epi-C1−C6 Fragment of FR901464 Using a Novel Bromolactolization

Abstract
A synthesis of a C4-epi-C1−C6 fragment of the antitumor agent FR901464 is reported. The advanced intermediate prepared in this study contains two of the three correct stereocenters found in the C1−C6 moiety of FR901464. For the preparation of this intermediate, we have developed a highly diastereoselective bromolactolization of a δ-alkenyl ketone.