relationship studies. Despite the extensive modifications, the binding to nicotinic acetylcholine receptor (nAChR) is in the low micromolar range according to an inhibition assay using 3H-thienylcyclohexyl-piperidine (TCP). A patch clamp functional assay gave comparable results. Compounds exemplified by 16, which consists of a biotinylated ligand linked to a bifunctionalphotoaffinityprobe (BPP), represent
A novel and non-radioactive bifunctionalphotoaffinityprobe (BPP) for the study of paclitaxel–microtubules interactions is designed and synthesized. This new BPP-taxoid bears a 3-nitro-5-trifluoromethyldiazirinyl-phenoxyacetyl group at C-3′N for photoaffinity/photocleavage and a biotin subunit at C-7 for affinity chromatography.