Total Synthesis of (−)-Antroalbocin A Enabled by a Strain Release-Controlled Photochemical 1,3-Acyl Shift
作者:Björn Siekmeyer、Dennis Lübken、Kevin Bajerke、Bastian Bernhardt、Peter R. Schreiner、Markus Kalesse
DOI:10.1021/acs.orglett.2c02347
日期:2022.8.12
The first bioinspired, enantioselective, and protecting group free total synthesis of the antibacterial sesquiterpenoid (−)-antroalbocin A (1) has been achieved in 12 steps (5.4% overall yield) from dimedone. An organocatalytic Robinson annulation gave rapid access to the tricyclic enone (19) as starting material for the photochemical domino process of deconjugation and sigmatropic 1,3-acyl shift.
抗菌倍半萜类化合物 (-)-antroalbocin A ( 1 ) 的第一个生物启发、对映选择性和无保护基团的全合成已经从二甲酮通过 12 个步骤(总产率 5.4%)实现。有机催化的 Robinson 环化可以快速获得三环烯酮 ( 19 ) 作为去共轭和 sigmatropic 1,3-酰基转移的光化学多米诺过程的起始材料。该过程的计算数据表明,1,3-酰基转移受益于高度应变的 1,3-烯酮8。8向其桥接异构体5的转变是放能的,因此与未应变的底物相比,能够提高转化率。