作者:Isao Kadota、Chie Kadowaki、Choul-Hong Park、Hiroyoshi Takamura、Kumi Sato、Philip W.H Chan、Stephan Thorand、Yoshinori Yamamoto
DOI:10.1016/s0040-4020(02)00039-x
日期:2002.3
described. The two key intermediates 3 and 55, representing the AB and EFGH ring frameworks, were prepared from 2-deoxy-d-ribose via linear sequences. Brown's asymmetric allylboration and the intramolecular hetero-Michael reaction were successfully applied to the construction of the A ring moiety. Synthesis of the EFGH ring segment 55 was achieved by the SmI2 mediated reductive cyclization, constructing
描述了冈比亚醇(1)的AB和EFGH环系统的立体控制合成。由2-脱氧-d-核糖经线性序列制备代表AB和EFGH环骨架的两个关键中间体3和55。布朗的不对称烯丙基硼化和分子内异迈克尔反应成功地应用于A环部分的建设。EFGH环段55的合成是通过SmI 2实现的介导的还原环化反应,构建了带有两个1,3-双轴甲基的EF环,以及钯催化的三氟甲磺酸烯醇盐和双歧烯酸锌的偶联,从而形成了GH环部分。还介绍了针对EFGH环框架的尝试收敛方法。