Solid phase method for the synthesis of peptide-spacer-lipid conjugates, conjugates synthesized thereby and targeted liposomes containing the same

摘要

A solid phase synthesis method for preparing a peptide-spacer-lipid conjugate, which method comprises:(1) synthesizing an amino acid residue protected peptidyl resin in solid phase; (2) conjugating a spacer and a lipid to the peptidyl resin, thereby forming a peptide-spacer-lipid resin having a peptide-spacer-lipid;(3) cleaving the peptide-spacer-lipid from the peptide-spacer-lipid resin;(4) removing at least one side chain protecting group from at least one amino acid of the peptide-spacer-lipid, thereby forming a peptide-spacer-lipid conjugate; and (5) subjecting the peptide-spacer-lipid conjugate to a process consisting of: (a) no further processing; (b) modifying a peptide portion of the peptide-spacer-lipid conjugate to a cyclic form during any of the foregoing steps (1)-(4); or (c) modifying a peptide portion of the peptide-spacer-lipid conjugate to a cyclic form after any of the foregoing steps (1)-(4), wherein the spacer is conjugated to each of the peptidyl resin and the lipid by a linkage functional group, the two linkage functional groups being the same or different. Peptide-spacer-lipid conjugates synthesized by the method, and liposomes containing such peptide-spacer-lipid conjugates, are also provided.