2β-Substituted Analogues of 4‘-Iodococaine: Synthesis and Dopamine Transporter Binding Potencies
作者:Kwasi S. Avor、Satendra Singh、Thomas W. Seale、Buddy Pouw、Garo P. Basmadjian
DOI:10.1021/jm980061w
日期:1998.6.1
4'-iodococaine (3) was synthesized and evaluated in an in vitro dopamine transporter (DAT) binding assay. Selective hydrolysis at the 2beta-position of 3 gave the carboxylic acid 15 that served as the intermediate for the synthesis of compounds 4, 5, and 6-11. The 2beta-alkyl derivatives were obtained from ecgonine methyl ester (17) through a series of reactions leading to the aldehyde 20. Wittig reaction
合成了一系列2β-取代的4'-碘多卡因(3)类似物,并在体外多巴胺转运蛋白(DAT)结合测定中进行了评估。在3的2β位选择性水解得到羧酸15,其用作合成化合物4、5和6-11的中间体。2-8烷基衍生物是从芽子碱甲酯(17)通过一系列导致醛20的反应获得的。20与甲基三苯基磷烷的Wittig反应,然后进行氢化和苯甲酰化,得到产物12和13。4'-的结合亲和力碘多卡因(3)比可卡因少10倍。3的羟甲烷,乙酸酯,酰胺,苄基酯,氧化唑和乙烷衍生物显示出降低的结合,而乙烯基,苯基和乙酯显示出适度的结合亲和力。与4'-碘多卡因相比,只有异丙基衍生物8的结合亲和力提高了2倍(3)。8'在2'位的羟基化反应得到14,不仅使DAT的结合力提高了2倍,而且还增强了DAT相对于去甲肾上腺素和5-羟色胺转运蛋白的选择性。在宽剂量范围内,化合物14未能在C57BL / 6J小鼠中刺激运动活性,并阻止了可卡因诱导的运动刺激作用。