N-(2-(2-bromideomoethoxy)ethyl)-N-methylpropionamide

This PROTAC linker is designed to serve as a reactive, functionalized amide-bearing tether that can be incorporated into bifunctional degraders. Its electrophilic bromide handle enables stepwise assembly of PROTAC architectures, supporting modular synthesis and late-stage conjugation strategies. The amide functionality provides chemical stability under typical organic synthesis conditions, facilitating reproducible linker installation. Detailed structural and synthetic guidance is provided below.

Structure: The linker contains a tertiary propionamide core connected to a flexible ethoxyethyl chain terminating in a bromomethyl-type electrophile. It features an amide carbonyl, ether oxygen, and C–Br bond suitable for substitution. Overall, it is a polar, moderately soluble organic scaffold with a reactive leaving group for coupling.

Reactivity: The brominated terminus is suitable for nucleophilic substitution to form C–C or C–heteroatom linkages during PROTAC construction, following common alkylation principles. Typical approaches use nucleophiles such as amines or thiols under basic conditions, often in polar aprotic solvents to promote substitution. No special catalysts are generally required beyond standard base-mediated SN-type reactivity, though reaction temperature and stoichiometry should be optimized for the intended coupling partner.