Simply copper: Copper(II)‐promoted intra‐ and intermolecular olefin diaminations bring together two differently functionalized amines into a vicinal relationship. High diastereoselectivity was obtained with chiral alkenes and results of the asymmetric catalysis are promising.
Chiral vicinal diamines, including 2-aminomethyl indolines and pyrrolidines, are useful as ligands for catalytic asymmetric reactions and are also found as important components of bioactive compounds. Herein is reported the first copper-catalyzed alkene diamination that occurs with high enantioselectivity. The substrate range is the broadest yet reported for this kind of intra-/intermolecular reaction sequence both with respect to γ-alkenyl sulfonamide substrate and external amine nucleophile. The resulting products expand the availability of substituted 2-aminomethyl indolines and pyrrolidines, privileged compounds in asymmetric catalysis and medicinal chemistry. A unique solution to a challenging oxidation problem related to copper catalyst turnover is also presented.
An enantioselective copper-catalyzed hydroamination / cyclization of N-sulfonyl-2-allylanilines for the synthesis of chiral 2-methylindolines is reported. Chiral 2-methylindolines are important subunits in drugs and bioactive compounds. This method provides chiral N-sulfonyl-2-methyl indolines in up to 90% ee.
Einfach Kupfer: In vicinaler Stellung befinden sich zwei unterschiedlich funktionalisierte Amine nach einer Kupfer(II)‐vermittelten intra‐ und intermolekularen Olefindiaminierung, bei der noch zusätzlich ein Kohlenstoffstereozentrum eingeführt wird. Ausgehend von chiralen Alkenen wurden hohe Diastereoselektivitäten erzielt.
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