Synthesis and Ligand Binding Studies of 4‘-Iodobenzoyl Esters of Tropanes and Piperidines at the Dopamine Transporter
作者:Satendra Singh、Garo P. Basmadjian、Kwasi S. Avor、Buddy Pouw、Thomas W. Seale
DOI:10.1021/jm970121i
日期:1997.8.1
group substitution at the 4'-position of cocaine decreased dopamine transporter binding potency, while a hydroxy or acetoxy group at the 2'-position exhibited increased binding potency for the dopamine transporter compared to cocaine (10- and 3.58-fold, respectively). 2'-Hydroxylation also enhanced the bidning potency of 4'-iodococaine (5) by 10-fold. Replacement of the tropane ring with piperidine led
合成了被设计为有效可卡因拮抗剂的可卡因的四个类似物和两个同源物。芽子碱甲酯(13)或适当取代的哌啶醇(19、21)与适当取代的4-碘苯甲酰氯之间的SN2反应得到托烷和哌啶的4-碘苯甲酸酯(5-8)。从2'-乙酰氧基可卡因(12)通过用干燥的HCl气体饱和的MeOH进行选择性酯交换反应,可以从2'-乙酰氧基可卡因(12)获得2'-羟基可卡因(9)。由乙酰水杨酰氯(23)和芽子碱甲酯(13)合成2'-乙酰氧基可卡因(12)。在多巴胺转运蛋白上测定这些化合物对[3H] WIN-35428的置换的结合亲和力。可卡因4'位置的碘基取代会降低多巴胺转运蛋白的结合力,而2'处的羟基或乙酰氧基会降低 与可卡因相比,β-位对多巴胺转运蛋白的结合力增强(分别是可卡因的10倍和3.58倍)。2'-羟基化还使4'-碘多卡因(5)的出价能力提高了10倍。用哌啶取代托烷环导致较差的结合亲和力。