Asymmetric Hydroxylative Phenol Dearomatization Promoted by Chiral Binaphthylic and Biphenylic Iodanes
作者:Cyril Bosset、Romain Coffinier、Philippe A. Peixoto、Mourad El Assal、Karinne Miqueu、Jean-Marc Sotiropoulos、Laurent Pouységu、Stéphane Quideau
DOI:10.1002/anie.201403571
日期:2014.9.8
The long‐standing quest for chiral hypervalent organoiodine compounds (i.e., iodanes) as metal‐free reagents for asymmetric synthesis continues. Although remarkable progress has recently been made in organoiodine‐catalyzed reactions using a terminal oxidant in stoichiometric amounts, there is still a significant need for “flaskable” chiral iodane reagents. Herein, we describe the synthesis of new iodobinaphthyls
长期以来,对手性高价有机碘化合物(即碘)作为不对称合成的无金属试剂的追求仍在继续。尽管最近使用化学计量的末端氧化剂在有机碘催化的反应中取得了显着进展,但是仍然非常需要“易燃”的手性碘试剂。在本文中,我们描述的新iodobinaphthyls和iodobiphenyls,他们成功的和有选择性的DMDO介导的氧化的合成成任一λ 3 -或λ 5个-iodanes,和它们的能力的评估,以促进非对称hydroxylative苯酚脱芳构化(HPD)的反应。最值得注意的是,一个C 2 -symmetrical biphenylicλ 5碘烷促进了HPD诱导的单萜百里酚转化为相应的基于邻喹啉的[4 + 2]环二聚体(即bis(thymol)),对映体过量高达94%。