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Novel solid-phase synthesis of thiol-terminated-poly(α-amino acid)-drug conjugate

Authors
Journal
Journal of Biochemical and Biophysical Methods
0165-022X
Publisher
Elsevier
Publication Date
Volume
23
Issue
1
Identifiers
DOI: 10.1016/0165-022x(91)90051-w
Keywords
  • Solid-Phase Synthesis
  • Telechelic Polymer
  • Daunomycin Conjugate

Abstract

Abstract A new method using a controlled pore glass solid support for the preparation of a thiol-terminated- polymerdrug, notably poly- l-glutamate-daunomycin having a terminal thiol group, is described. The method consists of first polymerizing an ester-protected glutamic acid onto an amino-disulfide functionalized controlled pore glass support. The ester protecting group is then removed, freeing the γ-carboxyl groups of the grafted polymer which then allows it to react with daunomycin. Finally, the disulfide bond linking the conjugated polymer-drug to the solid support is broken by thiolysis, thus releasing the desired product. The final product consists of only polymer-drug conjugates with terminal thiol group (global yield 26%). This novel method is much simpler and more elegant than more conventional preparation methods requiring solution phase techniques.

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