Stereochemically Rich Polycyclic Amines from the Kinetic Resolution of Indolines through Intramolecular Povarov Reactions
作者:Chang Min、Daniel Seidel
DOI:10.1002/chem.201602314
日期:2016.7.25
Under control of a chiral Brønsted acid catalyst, racemic indolines undergo intramolecular Povarov reactions with achiral aromaticaldehydes bearing a pendent dienophile. One enantiomer of the indoline reacts preferentially, resulting in the highly enantio‐ and diastereoselective formation of polycyclic heterocycles with four stereogenic centers. This kinetic resolution approach exploits the differential
Using weak interactions to control C–H mono-nitration of indolines
作者:Anima Bose、Prasenjit Mal
DOI:10.1039/c7cc06267b
日期:——
mononitration of indolines either at -C5 or -C7 positions is reported here. The role of multiple weak interactions such as steric factors, electronic effects, cation-π interaction, solvent polarity, etc. was established for the 100% regioselective electrophilicaromatic (ArSE) nitration using Cu(NO3)2 or AgNO3.
Chiral Phosphoric Acid Catalyzed Kinetic Resolution of Indolines Based on a Self-Redox Reaction
作者:Kodai Saito、Takahiko Akiyama
DOI:10.1002/anie.201510692
日期:2016.2.24
A strategy for oxidative kineticresolution of racemic indolines was developed, employing salicylaldehyde derivative as the pre‐resolving reagent and chiral phosphoric acid as the catalyst. The iminium intermediate, formed by the condensation reaction of an enantiomer of indoline with salicylaldehyde derivative, was hydrogenated by the same enantiomer of indoline to afford another enantiomer of indoline
Highly Efficient and Diastereoselective Gold(I)-Catalyzed Synthesis of Tertiary Amines from Secondary Amines and Alkynes: Substrate Scope and Mechanistic Insights
作者:Xin-Yuan Liu、Zhen Guo、Sijia S. Dong、Xiao-Hua Li、Chi-Ming Che
DOI:10.1002/chem.201101982
日期:2011.11.11
without the need of isolation of air/moisture‐sensitive enamine intermediates, and under mild reaction conditions (mostly roomtemperature and mild reducing agents). Mechanistic studies by NMR spectroscopy, ESI‐MS, isotope labeling studies, and DFT calculations on this gold(I)‐catalyzed tandem reaction reveal that the first step involving a monomeric cationic gold(I)–alkyne intermediate is more likely than
Monoamine Oxidase (MAO-N) Biocatalyzed Synthesis of Indoles from Indolines Prepared via Photocatalytic Cyclization/Arylative Dearomatization
作者:Fei Zhao、Domiziana Masci、Salvatore Ferla、Carmine Varricchio、Andrea Brancale、Serena Colonna、Gary W. Black、Nicholas J. Turner、Daniele Castagnolo
DOI:10.1021/acscatal.0c01351
日期:2020.6.5
The biocatalytic aromatization of indolines into indole derivatives exploiting monoamine oxidase (MAO-N) enzymes is presented. Indoline substrates were prepared via photocatalytic cyclization of arylaniline precursors or via arylative dearomatization of unsubstituted indoles and in turn chemoselectively aromatized by the MAO-N D11 wholecell biocatalyst. Computational docking studies of the indoline