The use of a continuous flow-reactor employing a mixed hydrogen–liquid flow stream for the efficient reduction of imines to amines
作者:Steen Saaby、Kristian Rahbek Knudsen、Mark Ladlow、Steven V. Ley
DOI:10.1039/b504854k
日期:——
Imines have been reduced to amines in high yield, and with excellent chemoselectivity, by catalytic hydrogenation in a continuous flow-reactor, utilising an electrochemically-generated hydrogen source to produce a mixed hydrogenâliquid flow stream.
Lewis Base Catalyzed, Sulfenium Ion Initiated Enantioselective, Spiroketalization Cascade
作者:Kimberly M. Hilby、Scott E. Denmark
DOI:10.1021/acs.joc.1c02271
日期:2021.11.5
A Lewisbasecatalyzed, enantioselective sulfenocyclization of alkenes to afford [6,6]spiroketals has been developed. The method uses a chiralLewisbase catalyst with an electrophilic sulfur source to generate enantioenriched thiiranium ion with alkenes. Upon formation, the thiiranium ion is subsequently captured in a cascade-type reaction, wherein a ketone oxygen serves as the nucleophile to open