1346434-60-3Relevant academic research and scientific papers
β-Eliminative releasable linkers adapted for bioconjugation of macromolecules to phenols
Schneider, Eric L.,Robinson, Louise,Reid, Ralph,Ashley, Gary W.,Santi, Daniel V.
, p. 1990 - 1997 (2013)
We recently reported a chemical approach for half-life extension that utilizes sets of releasable linkers to attach drugs to macromolecules via a cleavable carbamate group (Santi et al., Proc. Nat. Acad. Sci. U.S.A. 2012, 109, 6211-6216). The linkers undergo a β-elimination cleavage to release the free, native amine-containing drug. A limitation of the technology is the requirement for an amino group on the drug in order to form the carbamate bond, since most small molecules do not have an amine functional group. Here, we describe an approach to adapt these same β-elimination carbamate linkers so they can be used to connect other acidic heteroatoms, in particular, phenolic hydroxyl groups. The approach utilizes a methylene adaptor to connect the drug to the carbamate nitrogen, and an electron-withdrawing group attached to carbamate nitrogen to stabilize the system against a pH-independent spontaneous cleavage. Carbamate cleavage is driven by β-elimination to give a carboxylated aryl amino Mannich base which rapidly collapses to give the free drug, an aryl amine, and formaldehyde.
SULFONE LINKERS
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Paragraph 0087; 0088, (2013/03/26)
Sulfone linkers which couple drugs to carriers of various types are described. These linkers permit the release of the drug over time in a controlled manner. The release occurs through beta-elimination, and does not require enzymatic cleavage. Products of
