Total Synthesis and Glycosidase Inhibition Studies of (-)-Gabosine J and Its Derivatives
作者:Adiyala Vidyasagar、Kana M. Sureshan
DOI:10.1002/ejoc.201301782
日期:2014.4
The total syntheses of (–)-gabosine J and its two gabosinol derivatives, the reduced forms of (–)-gabosine J, were achieved by a chiral pool strategy that started from inexpensive and readily available D-mannitol. The desymmetrization of the C2-symmetric tri-O-isopropylidene mannitol through a H2SO4/silica mediated hydrolysis of one of the two terminal ketals and a ring-closing methathesis (RCM) of
(-)-gabosine J 及其两种 gabosinol 衍生物的全合成,即 (-)-gabosine J 的还原形式,是通过手性池策略实现的,该策略从廉价且容易获得的 D-甘露醇开始。通过 H2SO4/二氧化硅介导的两个末端缩酮之一的水解和适当保护的二烯的闭环复分解 (RCM),C2 对称三-O-异亚丙基甘露醇的去对称化是这些合成中的关键步骤。(-)-gabosine J 的制备涉及简单的步骤以及廉价且容易获得的试剂和起始材料,分 14 个步骤完成,总产率为 13%。类似地,gabosinol J-α 和 gabosinol J-β(gabosine J 的两种合成衍生物)分 13 个步骤制备,总产率分别为 11% 和 6%。对这些化合物的生物活性的初步研究表明,(-)-gabosine J 抑制 α-甘露糖苷酶,IC50 为 260 μM。其还原形式 gabosinol J-α 抑制