Stereoselective Oxidative Cyclization of <i>N</i>-Allyl Benzamides to Oxaz(ol)ines
作者:Ayham H. Abazid、Tom-Niklas Hollwedel、Boris J. Nachtsheim
DOI:10.1021/acs.orglett.1c01607
日期:2021.7.2
This study presents an enantioselective oxidative cyclization of N-allyl carboxamides via a chiral triazole-substituted iodoarene catalyst. The method allows the synthesis of highly enantioenriched oxazolines and oxazines, with yields of up to 94% and enantioselectivities of up to 98% ee. Quaternary stereocenters can be constructed and, besides N-allyl amides, the corresponding thioamides and imideamides
本研究介绍了通过手性三唑取代的碘芳烃催化剂对N-烯丙基甲酰胺进行对映选择性氧化环化。该方法允许合成高度对映体富集的恶唑啉和恶嗪,产率高达 94%,对映选择性高达 98% ee。可以构建四元立体中心,除了N-烯丙基酰胺外,相应的硫代酰胺和酰亚胺酰胺作为底物也具有良好的耐受性,从而产生大量的手性 5 元N-杂环。通过应用大量进一步的功能化,我们最终证明了观察到的手性杂环作为合成其他对映体富集目标结构的战略中间体的高价值。