Lobatamide C: Total Synthesis, Stereochemical Assignment, Preparation of Simplified Analogues, and V-ATPase Inhibition Studies
作者:Ruichao Shen、Cheng Ting Lin、Emma Jean Bowman、Barry J. Bowman、John A. Porco
DOI:10.1021/ja0352350
日期:2003.7.1
The total synthesis and stereochemical assignment of the potent antitumor macrolide lobatamide C, as well as synthesis of simplified lobatamide analogues, is reported. Cu(I)-mediated enamide formation methodology has been developed to prepare the highly unsaturated enamide side chain of the natural product and analogues. A key fragment coupling employs base-mediated esterification of a beta-hydroxy
报告了有效的抗肿瘤大环内酯洛巴胺 C 的全合成和立体化学分配,以及简化的洛巴胺类似物的合成。已开发出 Cu(I) 介导的烯酰胺形成方法来制备天然产物和类似物的高度不饱和烯酰胺侧链。关键片段偶联采用碱介导的 β-羟基酸和水杨酸氰甲基酯的酯化。已使用相关合成路线制备了三种额外的洛巴胺 C 立体异构体。lobatamide C 的 C8、C11 和 C15 的立体化学是通过立体异构体的比较和结晶衍生物的 X 射线分析来确定的。合成的洛巴胺 C、立体异构体和简化的类似物已被评估用于抑制牛嗜铬颗粒膜 V-ATP 酶。水杨酸苯酚,