作者:Eilidh G. Young、Phillip S. Grant、Daniel P. Furkert、Margaret A. Brimble
DOI:10.1021/acs.orglett.3c00902
日期:2023.4.28
Lycibarbarines A–C are spirocyclic alkaloids with a unique tetracyclic framework, consisting of tetrahydroquinoline and spiro-fused oxazine–sugar spiroketal subunits. The first total syntheses of lycibarbarines A–C were achieved over 10 steps (longest linear sequence) each. Through this work, it was discovered that the spiroketal unit of lycibarbarines A–C exhibits unusually high resistance to acid-mediated
Lycibarbarines A–C 是具有独特四环框架的螺环生物碱,由四氢喹啉和螺稠恶嗪-糖螺缩酮亚基组成。lycibarbarines A–C 的第一次全合成是通过 10 个步骤(最长的线性序列)实现的。通过这项工作,人们发现 lycibarbarines A–C 的螺缩酮单元对酸介导的异构化和差向异构化表现出异常高的抵抗力,这可能是由于碱性氮原子。因此,lycibarbarines 在防止螺缩酮异构体相互转化方面提供了一个有趣的案例研究,这可能对获得非热力学螺缩酮框架的努力具有指导意义。