Modular Synthesis, Orthogonal Post-Functionalization, Absorption, and Chiroptical Properties of Cationic [6]Helicenes
作者:Franck Torricelli、Johann Bosson、Céline Besnard、Mahshid Chekini、Thomas Bürgi、Jérôme Lacour
DOI:10.1002/anie.201208926
日期:2013.2.4
Pick and choose: Novel cationic diaza‐, azaoxo‐, and dioxo[6]helicenes are readily prepared and functionalized selectively by orthogonal aromatic electrophilic and vicarious nucleophilic substitutions (see scheme). Reductions, cross‐coupling, or condensation reactions introduce additional diversity and allow tuning of the absorption properties up to the near‐infrared region. The diaza salts can be
挑选:新型的阳离子二氮杂,氮杂氧和二氧杂[6]螺旋烯很容易制备,并通过正交的芳香亲电和替代亲核取代基选择性地官能化(请参阅方案)。还原,交叉偶联或缩合反应会引入额外的多样性,并允许调节吸收特性直至近红外区域。diaza盐可以拆分成单一对映体。