A cobalt-catalyzed synthesis of 1-aminoindenes via enantioselective [3 + 2] annulation is described. In this reaction, the desired products can be selectively prepared in either (R)- or (S)-form by the ligand-controlled synthesis, which is initiated by the cleavage of C–B, C–Br, or C–O bonds under very mild reaction conditions. In addition, this enantioselective cobalt catalysis provides high regioselectivity
Cobalt(II)-Catalyzed 1,4-Addition of Organoboronic Acids to Activated Alkenes: An Application to Highly<i>cis</i>-Stereoselective Synthesis of Aminoindane Carboxylic Acid Derivatives
It all adds up: The 1,4‐addition of organoboronicacids to activatedalkenes catalyzed by [Co(dppe)Cl2] is described. A [3+2]‐annulation reaction of ortho‐iminoarylboronic acids with acrylates to give various aminoindanecarboxylicacidderivatives with cis‐stereoselectivity is also demonstrated (see scheme; dppe=1,2‐bis(diphenylphosphino)ethane).
Cationic Palladium Complex-Catalyzed Diastereoselective Tandem Annulation of 2-Iminoarylboronic Acids with Substituted Alkynes: Enantioselective Synthesis of Aminoindene Derivatives by Double Asymmetric Induction
作者:Xufen Yu、Xiyan Lu
DOI:10.1002/adsc.201100363
日期:2011.10
2-iminoarylboronic acids and alkynes was developed for the synthesis of aminoindene derivativescatalyzed by cationic palladium complex. In addition, an enantioselective synthesis of aminoindene derivatives from the reaction of substituted (S)-2-(N-tert-butanesulfinylimino)arylboronicacids with a variety of alkynes catalyzed by chiral cationic palladium complex was also achieved by the double asymmetric induction