The intermediates 3 and 4, useful in the preparation of new biologically active bafilomycin derivatives, were obtained via a thermal retro-aldol reaction in diphenyl ether. The starting materials 5 and 7 for the retro- aldol reaction were synthesized in a few steps from bafilomycin C1 (2) with or without a protective group at 7-OH.
Granberg, Kenneth L.,Edvinsson, Karin M.,Nilsson, Kristina