Sets of Aldolase Antibodies with Antipodal Reactivities. Formal Synthesis of Epothilone E by Large-Scale Antibody-Catalyzed Resolution of Thiazole Aldol

[formula: see text] Three monoclonal aldolase antibodies, generated against a beta-diketone hapten by reactive immunization, catalyzed rapid and highly enantioselective retro-aldol reactions of ent-8a-k, providing optically pure 8a-k by kinetic resolution. Compounds (+/-)-8a, (+/-)-8g, and (+/-)-8k have been resolved in multigram quantities using 0.003, 0.005, and 0.0004 mol% antibody catalysts, respectively. Resolved compounds 8a-k are useful synthons for the construction of epothilones A-E (2-6) and their analogues. Here, a formal synthesis of epothilone E, 6 has been achieved starting from compound 8g.