Cobalt-Catalyzed Regioselective Olefin Isomerization Under Kinetic Control
作者:Xufang Liu、Wei Zhang、Yujie Wang、Ze-Xin Zhang、Lei Jiao、Qiang Liu
DOI:10.1021/jacs.8b01815
日期:2018.6.6
Olefin isomerization is a significant transformation in organic synthesis, which provides a convenient synthetic route for internal olefins and remote functionalization processes. The selectivity of an olefin isomerization process is often thermodynamically controlled. Thus, to achieve selectivity under kinetic control is very challenging. Herein, we report a novel cobalt-catalyzed regioselective olefin
作者:Jeishla L. M. Matos、Samantha A. Green、Yuge Chun、Vuong Q. Dang、Russell G. Dushin、Paul Richardson、Jason S. Chen、David W. Piotrowski、Brian M. Paegel、Ryan A. Shenvi
DOI:10.1002/anie.202003948
日期:2020.7.27
one another, but unreactive with biopolymers and water, is challenging. Shown here are cobalt catalysts that react with alkenes under dilute, aqueous, buffered conditions and promote efficient cycloisomerization and formal Friedel–Crafts reactions. The constraining conditions of bioorthogonal chemistry are beneficial for reaction efficiency as superior conversion at low catalyst concentration is obtained
Diastereodivergent Hydroxyfluorination of Cyclic and Acyclic Allylic Amines: Synthesis of 4-Deoxy-4-fluorophytosphingosines
作者:Alexander J. Cresswell、Stephen G. Davies、James A. Lee、Melloney J. Morris、Paul M. Roberts、James E. Thomson
DOI:10.1021/jo301056r
日期:2012.9.7
ammonium ion. Regioselective and stereospecificepoxide ring-opening by transfer of fluoride from a BF4– ion (an SN2-type process at the carbon atom distal to the ammonium moiety) then occurs in situ to give the corresponding amino fluorohydrin. Alternatively, an analogous reaction using 20 equiv of HBF4·OEt2 results in preferential epoxidation of the opposite face of the olefin, which is followed by regioselective