Stabilized zwitterionic derivatives from the reaction of 16-chloro-1-dehydrovincadifformine with sodium alkoxides
作者:Daniel Royer、Yang Liu Yu、Georgette Hugel、Jean Lévy
DOI:10.1016/s0040-4020(98)00293-2
日期:1998.6
Treatment of 16-chloro-1-dehydrovincadifformine 2a and 16-chloro-1-dehydrotabersonine 2b with sodium methoxide respectively yielded the 16-methoxyindolenines 11avs11b, and the two betaines 12avs12b and 14avs14b. Sodium ethoxide gave similar results, except for the absence of the 16-ethoxyindolenines. The structures of all derivatives were ascertained by their spectroscopic data, by chemical correlations
用甲醇钠处理16-氯-1-脱氢长春花碱2a和16-氯-1-脱氢烟碱二十二碳酸钠2b分别产生16-甲氧基吲哚肾上腺素11a对11b,以及两个甜菜碱12a对12b和14a对14b。除不存在16-乙氧基吲哚胺外,乙醇钠的结果相似。通过其光谱数据,化学相关性以及转化为化合物26来确定所有衍生物的结构,化合物26的外消旋物是通过全合成制备的。与前面描述的2a,b反应相反在醇中,在醇盐的影响下,内部螺栓连接的两性离子衍生物12-15的形成似乎决定了反应路径。