Cation-stabilizing groups make self-immolative linkers release drugs far faster
- Slow payload release from an activated self-immolative linker lets the drug drift from the activation site and blurs spatial precision. Substituents that stabilize the developing cation speed it up.
- Computed ion-pair stability tracked measured release rates, giving a design rule; linker–drug lipophilicity proved an overlooked factor.
- On palbociclib, faster linkers released better and gave radiation-dependent enzyme inhibition and cell-cycle effects.
💡 Points Based on the abstract
A DFT-computed ion-pair energy that tracks measured k is the useful part: para-substituents can be pre-screened in silico before anyone makes a benzyl carbamate. The catch is the trade-off. Cation-stabilizing donors likely erode plasma stability, and the lipophilicity effect hints at aggregation or solvation confounds. Serum half-life next to release rate would settle a lot, and palbociclib alone is too narrow a payload test.
Engineering Rapid Payload Release Rate in 1,6‐Elimination Processes of Self‐Immolative Linkers ↗