作者:Wacharee Harnying、Jörg-M. Neudörfl、Albrecht Berkessel
DOI:10.1021/acs.orglett.9b04034
日期:2020.1.17
An efficient oxidative NHC-catalyzed one-step transformation of (S)- or (R)-8-oxocitronellal to nepetalactone (NL) in enantio- and diastereomerically pure form has been developed. Several new and "easy to make" N-Mes- or N-Dipp-substituted 1,2,4-triazolium salts carrying nitroaromatic groups on N1 were synthesized and evaluated as precatalysts in combination with base and stoichiometric organic oxidant
已经开发了一种有效的氧化NHC催化的对映体和非对映体纯形式的(S)-或(R)-8-氧鞘甾醇向荆芥内酯(NL)的一步转化。合成了几种在N1上带有硝基芳族基团的新型且易于制造的N-Mes或N-Dipp取代的1,2,4-三唑鎓盐,并与碱和化学计量有机氧化剂一起作为预催化剂进行了评估。在优化的条件下,NLs的收率非常好,在温和条件下非对映异构纯。所使用的氧化剂可在操作简单的条件下回收和再循环。