Biogenetically Inspired Enantioselective Approach to Indolo[2,3-<i>a</i>]- and Benzo[<i>a</i>]quinolizidine Alkaloids from a Synthetic Equivalent of Secologanin
作者:Oriol Bassas、Núria Llor、Maria M. M. Santos、Rosa Griera、Elies Molins、Mercedes Amat、Joan Bosch
DOI:10.1021/ol0505609
日期:2005.7.1
oxodiester 1 undergoes stereoselective cyclocondensation with (S)-tryptophanol, (S)-(3,4-dimethoxyphenyl)alaninol, or the corresponding amino acids, in a process involving a tandem dynamic kinetic resolution/desymmetrization of diastereotopic groups, to give bicyclic lactams, which are cyclized to substituted indolo[2,3-a]- and benzo[a]quinolizidines.
[反应:参见文本]外消旋二氧二酯1与(S)-色氨酸,(S)-(3,4-二甲氧基苯基)丙氨醇或相应氨基酸进行立体选择性环缩合,过程涉及串联动态动力学拆分/去对称化非对映异构基团,得到双环内酰胺,将其环化成取代的吲哚[2,3-a]-和苯并[a]喹唑啉。