Ir-Catalyzed C−H Amidation of Aldehydes with Stoichiometric/Catalytic Directing Group
作者:Yun-Fei Zhang、Bin Wu、Zhang-Jie Shi
DOI:10.1002/chem.201603805
日期:2016.12.5
Ir‐catalyzed sp2 C−Hamidation of aldehydes with various anilines as stoichiometric or catalytic directing groups was accomplished. A wide range of substrates were selectively amidated in good to excellent yields with broad functional group tolerance. The iridacycle complexes were isolated, characterized, and proved as key intermediates. Kinetic studies and Hammett plots provided detailed understandings
用各种苯胺作为化学计量或催化方向的基团,对醛进行了Ir催化的sp 2 CH酰胺化反应。以良好的产率和优异的产率选择性选择性地酰胺化各种底物,并具有宽泛的官能团耐受性。分离,表征并证明了iridacycle复合物是关键中间体。动力学研究和Hammett图提供了对这种酰胺化反应的详细了解。根据机理,证明了富电子的ArSO 2 N 3对于分子间sp 3 CH酰胺化有效。
Visible-Light-Mediated, Chemo- and Stereoselective Radical Process for the Synthesis of <i>C</i>-Glycoamino Acids
作者:Peng Ji、Yueteng Zhang、Yongyi Wei、He Huang、Wenbo Hu、Patrick A. Mariano、Wei Wang
DOI:10.1021/acs.orglett.9b00724
日期:2019.5.3
for efficient synthesis of C-glycosyl amino acids is described. Different from typical photoredox-catalyzed reactions of imines, the new process follows a pathway in which α-imino esters serve as electrophiles in chemoselective addition reactions with nucleophilic glycosyl radicals. The process is highlighted by the mild nature of the reaction conditions, the highly stereoselectivity attending C–C