Iodoarene-Catalyzed Stereospecific Intramolecular sp<sup>3</sup> C–H Amination: Reaction Development and Mechanistic Insights
作者:Chendan Zhu、Yong Liang、Xin Hong、Heqing Sun、Wei-Yin Sun、K. N. Houk、Zhuangzhi Shi
DOI:10.1021/jacs.5b03488
日期:2015.6.24
A new strategy is reported for intramolecular Sp(3) C-H amination :under mild reaction conditions using iodoarene as catalyst and m-CPBA as oxidant. This C-H functionalization involving iodine(III) reagents generated in situ occurs readily at sterically hindered tertiary C-H bonds. DFT (M06-2X) calculations show that the preferred pathway involves an iodonium cation intermediate and proceeds via an energetically concerted transition state, through hydride transfer followed by the spontaneous C-N bond formation. ThiS leads to the experimentally observed amination at a chiral center without loss of stereo chemical information.