Polymer-bound paclitaxel derivatives

摘要

A polymer conjugate consisting essentially of: from 90 to 99.9 mol % of units represented by the formula <IMAGE> from 0.1 to 5 mol % of units represented by the formula <IMAGE> wherein one of R1 and R2 is a copolymer residue of the formula <IMAGE> and the other one is hydrogen atom; from 0 to 9.9 mol % of units represented by the formula <IMAGE> wherein R is a phenyl or t-butoxy group, R3 is H or an acetyl group, A and A1 which may be the same or different, represent a chemical single bond, an amino acid residue or peptide spacer selected from beta Ala, Gly, Phe-Gly, Phe-Phe-, Leu-Gly, Val-Ala, Phe-Ala, Leu-Phe, Leu-Ala, Phe-Leu-Gly, Phe-Phe-Leu, Leu-Leu-Gly, Phe-Tyr-Ala, Phe-Gly-Phe, Phe-Phe-Gly, Phe-Leu-Gly-Phe, Gly-Phe-Leu-Gly-Phe,Gly- beta Ala, Phe-Gly- beta Ala, Phe-Phe- beta Ala, Leu-Gly- beta Ala, Val-Ala- beta Ala, Phe-Ala- beta Ala, Leu-Phe- beta Ala, Leu-Gly- beta Ala, Phe-Leu-Gly- beta Ala, Phe-Phe-Leu beta Ala, Leu-Leu-Gly- beta Ala, Phe-Tyr-Ala- beta Ala, Phe-Gly-Phe- beta , Phe-Phe-Gly beta Ala, Phe-Leu-Gly-Phe- beta Ala or Gly-Phe-Leu-Gly-Phe- beta Ala. The compounds are endowed with antitumor activity and show improved water solubility and decreased toxicity in comparison with paclitaxel or its known analogs. A method for their preparation and pharmaceutical compositions containing them are also described.