Synthesis of a biologically active isomer of kotalanol, a naturally occurring glucosidase inhibitor
作者:Razieh Eskandari、Kumarasamy Jayakanthan、Douglas A. Kuntz、David R. Rose、B. Mario Pinto
DOI:10.1016/j.bmc.2010.03.027
日期:2010.4
The syntheses of an isomer of kotalanol, a naturally occurring glucosidase inhibitor, and of kotalanol itself are described. The target compounds were synthesized by nucleophilic attack of PMB-protected 1,4-anhydro-4-thio-d-arabinitol at the least hindered carbon atom of two 1,3-cyclic sulfates, which were synthesized from d-mannose. Methoxymethyl ether and isopropylidene were chosen as protecting
描述了天然存在的葡糖苷酶抑制剂的果糖醇的异构体和果糖醇本身的合成。目标化合物通过亲核攻击合成PMB保护的1,4-脱水-4-硫代- d -arabinitol在两个1,3-环硫酸酯,将其从合成的至少受阻碳原子d甘露糖。选择甲氧基甲基醚和异亚丙基作为保护基。后一组对于确保偶联产物的容易的脱保护以一步一步的顺序以产生邻苯二酚和其异构体是至关重要的。kotalanol的立体异构体,具有在C-6'立体中心具有相反立体化学,抑制肠麦芽糖酶人类葡糖淀粉酶(ntMGAM)N-末端催化结构域与ķ我值为0.20±0.02μM; 相比之下,可可醇的K i值为0.19±0.03μM。结果表明,在C-6'处的构型对于针对该酶的抑制活性是无关紧要的。