N-(4-Bromophenyl)-
N-phenylacrylamide is a cysteine-reactive small-molecule fragment for chemoproteomic and ligandability studies for both traditionally druggable proteins as well as ″undruggable,″ or difficult-to-target, proteins. This fragment electrophile, or ″scout″ fragment, can be used alone in fragment-based covalent ligand discovery or incorporated into bifunctional tools such as electrophilic PROTAC
® molecules for
targeted protein degradation as demonstrated by the
Cravatt Lab for E3 ligase discovery.