Iodoarene-Catalyzed Stereospecific Intramolecular sp3 C–H Amination: Reaction Development and Mechanistic Insights
摘要:
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.
Scope of direct arylation of fluorinated aromatics with aryl sulfonates
作者:Joyce Wei Wei Chang、Eugene Yurong Chia、Christina Li Lin Chai、Jayasree Seayad
DOI:10.1039/c2ob06840k
日期:——
The scope and limitations of direct arylation of fluorinatedaromatics with aryl sulfonates was examined. Pd(OAc)2, in the presence of MePhos and KOAc in THF, efficiently catalyzed the direct arylation of fluoro aromatics with aryl triflates under ambient conditions. Sterically hindered triflates and heteroaryl triflates gave good to excellent yields of the cross coupled products using a modified catalyst
Pyrrole and pyrazole derivatives as potentiators of glutamate receptors
申请人:Albaugh Ann Pamela
公开号:US20070066573A1
公开(公告)日:2007-03-22
The present invention relates to pyrrole and pyrazole compounds of formula (I) and their pharmaceutically acceptable salts, and further relates to their use in treating schizophrenia, cognitive deficits associated with schizophrenia, Alzheimer's disease, dementia of the Alzheimer's type, mild cognitive impairment, or depression. The compounds act as potentiators on glutamate receptors, in particular AMPA and the GluR family.
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.