Hydroxyalkylation with Cyclic Sulfates: Synthesis of Carbazole Derived CB<sub>2</sub>Ligands with Increased Polarity
作者:Corinna Lueg、Fabian Galla、Bastian Frehland、Dirk Schepmann、Constantin G. Daniliuc、Winnie Deuther-Conrad、Peter Brust、Bernhard Wünsch
DOI:10.1002/ardp.201300255
日期:2014.1
In order to increase the polarity of the potent CB2 ligand 1a, the homologous hydroxyalkyl carbazoles 2a–c were prepared and pharmacologically evaluated. An important step in the synthesis is the hydroxyalkylation of carbazole with cyclic sulfates providing the 2‐hydroxyethyl and 3‐hydroxypropyl derivatives 5a and 5b in a one‐step reaction. The final propionamides 2a–c were prepared using the recently
为了增加有效的 CB2 配体 1a 的极性,制备了同源的羟烷基咔唑 2a-c 并对其进行了药理学评估。合成中的一个重要步骤是咔唑与环状硫酸盐的羟烷基化,在一步反应中提供 2-羟乙基和 3-羟丙基衍生物 5a 和 5b。最终的丙酰胺 2a-c 是使用最近报道的偶联试剂 COMU® 制备的。2c 的 X 射线晶体结构显示出 3-苯基-1,2,4-恶二唑联芳基系统的几乎共面排列。2a 极性增加与 CB2 亲和力降低近 100 倍有关。3-羟丙基衍生物 2b 代表了亲脂性和 CB2 亲和力之间的最佳折衷(Ki = 33 nM)。