First Asymmetric Total Synthesis of Us-7 and -8, Novel <i>D</i>-<i>s</i><i>eco</i> Corynanthe-Type Oxindole Alkaloids from <i>Uncaria </i><i>a</i><i>ttenuata</i>: Structure Revision of Us-7 and Determination of Absolute Stereochemistry
作者:Hiromitsu Takayama、Rika Fujiwara、Yasuko Kasai、Mariko Kitajima、Norio Aimi
DOI:10.1021/ol035128a
日期:2003.8.1
[reaction: see text] Starting from (S)-glycidol, the asymmetric total synthesis of novel D-seco Corynanthe-type oxindoles Us-7 and Us-8 was accomplished. The structure of Us-7 was revised from the reported structure 1 with the (3R,7S) form to structure 22 with (3S,7R), and the absolute stereochemistry at C15 of both alkaloids was established.
[反应:见正文]从(S)-缩水甘油开始,完成了新型D-seco Corynanthe型氧吲哚Us-7和Us-8的不对称全合成。Us-7的结构从报道的结构(3R,7S)修订为结构22(3S,7R),并建立了两种生物碱在C15的绝对立体化学。