The object of the invention is to develop baccatin derivatives useful for
preparing taxoid compounds such as paclitaxel and a process for the
producing the same. The invention provides baccatin derivatives
represented by the general formula (I) as well as a process for producing
baccatin derivatives represented by the general formula (I) above, which
comprises allowing a baccatin represented by the general formula (II) to
react with a .beta.-ketoester in the absence of a catalyst or in the
presence of a tin compound or an amine base, preferably under reduced
pressure.
