Enantioselective Organocatalytic Synthesis of 2-Oxopiperazines from Aldehydes: Identification of the Elusive Epoxy Lactone Intermediate
作者:Nikolaos Kaplaneris、Constantinos Spyropoulos、Maroula G. Kokotou、Christoforos G. Kokotos
DOI:10.1021/acs.orglett.6b02699
日期:2016.11.18
organocatalytic linchpin catalysis approach was envisaged to convert simple aldehydes into enantioenriched 2-oxopiperazines. A four-step reaction sequence (chlorination, oxidation, substitution, and cyclization) was developed and led to different substitution patterns in high yields and selectivities. The reaction mechanism was studied, and the previously elusive epoxy lactone intermediate was identified by
设想了一种有机催化的关键催化方法,将简单的醛转化为对映体富集的2-氧代哌嗪。开发了四步反应序列(氯化,氧化,取代和环化),并以高收率和选择性导致了不同的取代方式。研究了反应机理,并通过HRMS鉴定了以前难以捉摸的环氧内酯中间体。