Stereochemical significance of O to N atom interchanges within cationic helicenes: experimental and computational evidence of near racemization to remarkable enantiospecificity
作者:Geraldine M. Labrador、Céline Besnard、Thomas Bürgi、Amalia I. Poblador-Bahamonde、Johann Bosson、Jérôme Lacour
DOI:10.1039/c9sc02127b
日期:——
Oxygen atoms of cationic dioxa and azaoxa [6]helicenes can be exchanged by amino groups to form azaoxa and diaza [6]helicenes respectively. The mild reaction conditions developed herein allow the construction of libraries of derivatives with sensitive and/or functionalized side chains. Using enantioenriched dioxa or azaoxa helicene precursors, these exchanges lead to either near racemization (es 3%)