Highly enantioselective construction of CF3-bearing all-carbon quaternary stereocenters: Chiral spiro-fused bisoxazoline ligands with 1,1′-binaphthyl sidearm for asymmetric Michael-type Friedel-Crafts reaction
作者:Robert Li-Yuan Bao、Lei Shi、Kang Fu
DOI:10.1016/j.cclet.2021.10.062
日期:2022.5
A novel class of chiral spiro-fused bisoxazolineligands possessing a deep chiral pocket was prepared. The developed ligands have been employed in the nickel-catalyzed highly enantioselective Michael-type Friedel-Crafts reaction, affording the products bearing a trifluoromethylated all-carbon quaternary stereocenter with moderate to excellent yields (up to 99%) and good to excellent enantioselectivies
制备了一类具有深手性口袋的新型手性螺稠合双恶唑啉配体。开发的配体已用于镍催化的高对映选择性迈克尔型傅克反应,提供具有中等至优异产率(高达 99%)和良好至优异对映选择性(高达> 99.9% ee )。此外,提出的手性口袋模型表明,吲哚从β - CF 3 - β-二取代硝基烯烃的Re-面进攻是有利的。