A New Synthetic Route to (North)-Methanocarba Nucleosides Designed as A<sub>3</sub> Adenosine Receptor Agonists
作者:Bhalchandra V. Joshi、Hyung Ryong Moon、James C. Fettinger、Victor E. Marquez、Kenneth A. Jacobson
DOI:10.1021/jo0487606
日期:2005.1.1
(N)-methanocarba nucleosides, such as MRS1898 and MRS2346, are examples of full agonists of the human A3 AR. An improved convergent approach from easily accessible 2,3-O-isopropylidene-d-erythrose (2b), and the combination of a strategic intramolecular cyclopropanation step plus the acid-catalyzed isomerization of an isopropylidene group, provided a suitable pseudosugar precursor (23) for the synthesis of MRS1898
A 3腺苷受体(AR)的激活与脑保护,心脏保护和抗癌作用有关。在有效的和选择性的A 3 AR激动剂中,有新颖的甲氨基碳腺苷类似物,其中伪核糖部分的构象被锁定在伪旋转周期的北半球。5'-尿酰胺(N)-甲氨基甲酸核苷,例如MRS1898和MRS2346,是人A 3 AR完全激动剂的实例。从容易获得2,3-一种改进的会聚途径ö异亚丙基d -erythrose(2b中),以及策略性的分子内环丙烷化步骤与异亚丙基的酸催化异构化相结合,为合成MRS1898,MRS2346和相关类似物提供了合适的假糖前体(23)。这种新的合成路线使用了容易获得的构建基块,并为以合理规模准备各种目标开辟了道路。