首次开发了手性钌催化四吡啶型N-杂芳烃的对映选择性氢化反应。在无膦手性阳离子钌二胺配合物存在下,相邻四杂芳族底物的部分还原顺利进行,提供了前所未有的高反应活性、对映选择性和非对映选择性(产率高达 93%、>99% ee 和 92:8 dr )。手性四齿吡啶胺产物作为手性配体的潜在应用已在铜催化吲哚和硝基烯烃之间的不对称弗里德尔-克来福特烷基化反应中得到证明。
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