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.
The synthesis and antibacterial activity of totarol derivatives. part 1: modifications of ring-C and pro-drugs
作者:Gary B Evans、Richard H Furneaux、Michael B Gravestock、Gregory P Lynch、G.Kenneth Scott
DOI:10.1016/s0968-0896(99)00162-5
日期:1999.9
pro-drugs derived from, the potent antibacterial diterpene totarol (1) were synthesized in order to elucidate the minimum structural requirements for antibacterial activity and to seek compounds with good bioavailability in vivo. These analogues varied in the structural features of their aromatic rings and the prodrugs were O-glycosylated derivatives. They were tested in vitro against three gram-positive