Synthesis and Small-Animal Positron Emission Tomography Evaluation of [<sup>11</sup>C]-Elacridar As a Radiotracer to Assess the Distribution of P-Glycoprotein at the Blood−Brain Barrier
With the aim to develop a positronemissiontomography (PET) tracer to assess the distribution of P-glycoprotein (P-gp) at the blood−brain barrier (BBB) in vivo, the potent third-generation P-gp inhibitor elacridar (1) was labeled with 11C by reaction of O-desmethyl 1 with [11C]-methyl triflate. In vitro autoradiography and small-animal PET imaging of [11C]-1 was performed in rats (n = 3), before and