[α-11C]Benzoyl chloride was synthesized and purified by normal phase HPLC. [11C]MK-996 ([11C]N-[[4′[(2-ethyl-5,7-dimethyl-3H-imidazo [4,5-b]pyridin-3-yl)methyl][1,1′-biphenyl]-2-yl]sulfonyl]-benzamide), a potent and selective ligand for the AT1 receptor, was prepared by N-benzoylation of L-159,221 with [α-11C]benzoyl chloride in tetrahydrofuran using lithium bis(trimethylsilyl)amide as a base. The radiotracer was purified by semi-preparative reverse-phase HPLC. The average specific activity was 1162 mCi/μmol calculated at end-of-synthesis (EOS). The average time of synthesis including formulation was 30 minutes.
通过正相高效
液相色谱法合成并纯化[α-11C]
苯甲酰氯。制备了[11C]MK-996 ([11C]N-[[4′[(2-乙基-5,7-二甲基-3H-
咪唑并[4,5-b]
吡啶-3-基)甲基][1,1′-
联苯]-2-基]磺酰基]苯甲酰胺),这是一种对AT1受体具有强大选择性的
配体,通过在
四氢呋喃中使用[α-11C]
苯甲酰氯与L-159,221进行N-苯甲酰化,并采用双(三甲基
硅基)
锂胺作为碱来制备。该放射性示踪剂通过半制备型反相高效
液相色谱法进行纯化。计算得到的平均比活度在合成结束时为1162 mCi/μmol。包括制剂在内的平均合成时间为30分钟。