Synthesis of polyfunctional quinolizidine alkaloids: development towards selective glycosidase inhibitors
作者:Ganesh Pandey、Debasish Grahacharya、K. S. Shashidhara、M. Islam Khan、Vedavati G. Puranik
DOI:10.1039/b907007a
日期:——
A highly divergent route to a variety of quinolizidine alkaloids is described. The enantiomeric precursors 22a and 22b utilized for the synthesis of these alkaloids were constructed stereospecifically from the PET cyclization of the corresponding acetylene tethered α-trimethylsilyl amine moieties 21a and 21b, respectively, both of which were synthesised from D-ribose. The polyhydroxy quinolizidine alkaloid 7 was found to be a selective inhibitor of α-galactosidase with Ki 83.9 μM. The amine analogs 18, 12 and 10 are found to be selective and potent inhibitors of α-glucosidase with Ki 28, 120 and 140 μM, respectively.
本文描述了一种高度不同的喹嗪生物碱合成路线。用于合成这些生物碱的对映体前体 22a 和 22b,是分别从相应的乙炔系α-三甲基硅胺分子 21a 和 21b 的 PET 环化中立体定向生成的,这两个分子都是从 D-核糖合成的。研究发现,多羟基喹嗪生物碱 7 是 α-半乳糖苷酶的选择性抑制剂,Ki 为 83.9 μM。发现胺类似物 18、12 和 10 是 α-葡萄糖苷酶的选择性强效抑制剂,Ki 分别为 28、120 和 140 μM。