New chemistry of mitomycin C

A new synthetic approach to biaryls of the rhazinilam type. Application to synthesis of three novel phenylpyridine-carbamate analogues

The synthesis of three novel racemic phenylpyridine-carbamate analogues of rhazinilam and their biological evaluation as inhibitors of microtubule assembly and disassembly by interaction with tubulin are described. The sterically hindered ortho-disubstituted biaryl unit as the challenging key structural element is first obtained by a sequential regiocontrolled nucleophilic addition of a lithium ortho-lithiohomobenzylic alkoxide species to 3-bromo-5-oxazolyl pyridine as the electrophile and a subsequent oxidation step. The incorporation of the amino group by replacement of the bromide has been achieved using a Buchwald-Hartwig amination coupling. Ultimate deprotection steps furnished free-amino and free-hydroxyl appendages which were connected by phosgenation to furnish the nine-membered median carbamate ring.

Second generation analogs of etoposide and mitomycin C

Programs directed towards the selection of etoposide and mitomycin C analogs which exhibit superior activity, reduced toxicity and improved pharmaceutics have met with partial success. Etopofos (BMY 40481) has been chosen for development as a prodrug of etoposide possessing superior pharmaceutical properties. BMY 25067, an analog of mitomycin C, is also under development based on its improved activity profile, acceptable toxicology profile and possibly different mechanism of action.