Enantioselective aza-Henry reactions of cyclic α-carbonyl ketimines under bifunctional catalysis
作者:Alejandro Parra、Ricardo Alfaro、Leyre Marzo、Alberto Moreno-Carrasco、José Luis García Ruano、José Alemán
DOI:10.1039/c2cc34053d
日期:——
The aza-Henry reaction of nitroalkanes with the CN group of 2-aryl-3H-indol-3-ones catalyzed by thiourea-chincona derivatives takes place with good yield and high ee's.
Asymmetric Brønsted Acid-Catalyzed Friedel-Crafts Reactions of Indoles with Cyclic Imines - Efficient Generation of Nitrogen-Substituted Quaternary Carbon Centers
作者:Magnus Rueping、Sadiya Raja、Alberto Núñez
DOI:10.1002/adsc.201000952
日期:2011.3.7
A new enantioselective Brønsted acid‐catalyzed Friedel–Crafts reaction of indole with cyclicimines has been develeoped. This organocatalytic reaction provides for the first time optically active indolindolinone derivatives in high yields and with excellent enantioselectivities (up to 91% ee) under mild reaction conditions.
Asymmetric Brønsted acid-catalyzed aza-Diels–Alder reaction of cyclic <i>C</i>-acylimines with cyclopentadiene
作者:Magnus Rueping、Sadiya Raja
DOI:10.3762/bjoc.8.208
日期:——
A new chiral Bronsted acid-catalyzedaza-Diels-Alderreaction of cyclic C-acylimines with cyclopentadiene has been developed. The reaction provides optically active aza-tetracycles in good yields with high diastereo- and enantioselectivities under mild reaction conditions.
CuH-Catalyzed Synthesis of 3-Hydroxyindolines and 2-Aryl-3H-indol-3-ones from <i>o</i>-Alkynylnitroarenes, Using Nitro as Both the Nitrogen and Oxygen Source
CuH-catalyzed diasterospecific synthesis of 3-hydroxyindolines and 2-aryl-3H-indol-3-ones have been developed from o-alkynylnitroarenes in the presence of hydrosilane as the reductant. The protocol employs nitro as both nitrogen and oxygen sources for the intramolecular simultaneous construction of C-N and C-O bonds.