Efficient Synthesis of Cryptophycin-52 and Novel<i>para</i>-Alkoxymethyl Unit A Analogues
作者:Stefan Eißler、Tobias Bogner、Markus Nahrwold、Norbert Sewald
DOI:10.1002/chem.200901750
日期:2009.10.26
respective amino and hydroxy acids. A new synthetic route to unit A allows the selective generation of all four stereogenic centres in a short, efficient and reliable synthesis and contributes to an easier and faster synthesis of cryptophycins. The first two stereogenic centres are introduced by a catalytic asymmetric dihydroxylation, whereas the remaining two stereogenic centres are introduced with
隐藻素是高度细胞毒性的环状双缩肽的家族。它们显示出对多药耐药肿瘤细胞的抗肿瘤活性。隐藻素由对应于各自的氨基酸和羟基酸的四个构件(AD单元)组成。通往A单元的新合成途径可在短,有效和可靠的合成中选择性生成所有四个立体异构中心,并有助于更轻松,更快速地合成隐藻素。前两个立体异构中心是通过催化不对称二羟基化作用引入的,而其余两个立体异构中心是通过非对映选择性底物控制引入的。立体异构二醇功能还用作环氧化物前体。该方法用于综合本机单元A构建块以及三个制备了隐霉素52和三种类似隐藻霉素的对烷氧基甲基类似物。所述的大环开环-depsipeptides是基于闭环复分解。