Sulfamate Acetamide Warheads for Covalent Payload Release
Solution Overview
Problem
Existing electrophilic molecules used in targeted covalent inhibitors (TCIs) face challenges in achieving an optimal balance between selectivity and potency due to their reactivity, with chloroacetamides being too reactive and acrylamides being less reactive, limiting their application, and current covalent inhibitor-based probes fail to release payloads effectively.
Innovation Solution
Development of sulfamate acetamides as electrophilic warheads with tunable reactivity, enabling covalent ligand-directed release (CoLDR) chemistry, which forms a covalent bond with target cysteines and releases sulfamic acid, allowing for site-specific labeling and payload delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If chloroacetamides are used as electrophilic warheads, then reactivity and potency are improved, but selectivity deteriorates due to off-target reactivity
Solution Approach 1:
The patent applies parameter changes by systematically modifying the electrophilic warhead structure from highly reactive chloroacetamides to less reactive sulfamate acetamides. This involves changing the chemical parameters (electrophilicity, steric bulk, electronic properties) to achieve an optimal balance where the warhead is reactive enough to bind the target cysteine but stable enough to avoid off-target reactions, thereby resolving the contradiction between reactivity and selectivity
2Object-affected harmful factors
If acrylamides are used as electrophilic warheads, then selectivity is improved, but potency deteriorates due to reduced reactivity
Solution Approach 1:
The patent employs composite materials by combining the acrylamide scaffold with additional electrophilic functionality (sulfamate or other warheads) to create a dual-function molecule. The acrylamide provides selectivity through its known binding profile, while the added electrophilic group enhances potency by enabling covalent bond formation with the target cysteine, thus resolving the contradiction between selectivity and potency
3Object-affected harmful factors
If covalent inhibitor-based probes are used for site-specific labeling, then selectivity is improved, but payload release capability deteriorates
Solution Approach 1:
The patent merges two previously separate functions into a single integrated molecule: the covalent binding function (providing site-specific labeling) and the payload release function. This is achieved by designing the probe so that the covalent bond formation with the target cysteine triggers the release of the payload, thereby simultaneously achieving both site-specific labeling and payload delivery capabilities
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Sulfamate acetamides provide a balanced reactivity profile, enhancing selectivity and potency of TCIs while enabling site-specific labeling and active payload release, demonstrated through effective inhibition of BTK and other proteins.
Implementation Method 1
electrophilic small molecules that are able to form covalent bonds with nucleophilic amino acids like cysteine
Implementation Method 2
forms a covalent bond with target cysteines and releases sulfamic acid
Data Source
AI summary
Provided herein electrophiles (I) comprising a sulfamate group for covalent ligand-directed release chemistry (CoLDR). Formula(I).