Chiral Bis(oxazolidine)pyridine–Copper-Catalyzed Enantioselective Friedel–Crafts Alkylation of Indoles with Nitroalkenes
作者:Takayoshi Arai、Toru Sato
DOI:10.1055/s-0033-1340311
日期:——
asymmetric Friedel–Crafts reaction of indoles with nitroalkenes was catalyzed by the stereochemically tunable bis(oxazolidine)pyridine (PyBodine)–Cu(OTf)2 complex. Using the PyBodine(Val)–Cu(OTf)2 catalyst gave the Friedel–Crafts adducts with highly enantioselective manner. For the 1,4-bis[(E)-2-nitrovinyl]benzene, the reaction proceeded in a meso-trick manner to give the chiral double Friedel–Crafts adduct
Asymmetric Ruthenium-Catalyzed Hydrogenation of Terpyridine-Type <i>N</i>-Heteroarenes: Direct Access to Chiral Tridentate Nitrogen Ligands
作者:Chenghao Li、Yixiao Pan、Yu Feng、Yan-Mei He、Youran Liu、Qing-Hua Fan
DOI:10.1021/acs.orglett.0c02268
日期:2020.8.21
first enantioselective hydrogenation of terpyridine-type N-heteroarenes has been successfully developed by using Ru(diamine) complexes as catalysts, providing partially reduced chiral pyridine-amine-type products in high yield (up to 93%) with excellent diastereo- and enantioselectivity (up to 94:6 dl/meso, > 99% ee). These pyridine-amine-type compounds can be served as a new class of chiral multidentate