Biomimetic Organocatalytic Approach to 4-Arylquinolizidine Alkaloids and Application in the Synthesis of (−)-Lasubine II and (+)-Subcosine II
作者:Seerat Virk、Sunil V. Pansare
DOI:10.1021/acs.orglett.9b01840
日期:2019.7.19
An enantioselective, biomimetic organocatalytic synthesis of 4-arylquinolizidin-2-ones, key intermediates in the synthesis of several Lythraceae alkaloids, was developed. The methodology features S-proline-mediated Mannich/aza-Michael reactions of readily available arylideneacetones and Δ1-piperideine. The total syntheses of (−)-lasubine II and (+)-subcosine II as well as the formal syntheses of structurally
开发了一种对映选择性的,仿生的有机催化合成4-芳基喹啉并丁-2-酮的方法,这是几种豆科生物碱合成中的关键中间体。该方法特征小号-脯氨酸-介导的曼尼希/现成arylideneacetones和Δ的氮杂-迈克尔反应1 -piperideine。实现了(-)-lasubine II和(+)-subcosine II的总合成以及与结构相关的千屈菜科生物碱的形式合成。使用Δ的1曼尼期吡咯啉/氮杂-迈克尔反应提供对映体富集5- arylindolizidin -7-酮,其前体的非阿片类镇痛剂。