Enantioselective Synthesis of Benzyl tert-Butyl Sulfoxides
作者:Majid Khalil Syed、Mike Casey
DOI:10.1002/ejoc.201101059
日期:2011.12
pure benzyl sulfoxides are effective tools for the formation of new C–C bonds with control of configuration at new stereogenic centres. The reaction of enantioenriched tert-butyl tert-butanethiosulfinate with benzyllithium derivatives, obtained by deprotonation of the corresponding toluene derivatives, gave a wide variety of benzyl tert-butyl sulfoxides with complete inversion of configuration. The benzyl
Stereoselective Synthesis of Lignans of Three Structural Types from a Common Intermediate, Enantioselective Synthesis of (+)-Yangambin
作者:Majid Khalil Syed、Cian Murray、Mike Casey
DOI:10.1002/ejoc.201402584
日期:2014.9
acid-catalysed cyclisation in EtOH furnished (+)-yangambin in good yield. The resulting synthesis is short, efficient and highly selective. Formation of 2,5-diaryltetrahydrofuran lignans was observed as a side reaction in the final step of yangambin synthesis. Acid-catalysed cyclisation of the aldol intermediate gave a completely different outcome. Dehydration to give an enone was followed by two electrophilic