properties and development of a general method to construct these derivatives has now been developed. Indolines (2,3-dihydroindoles) and isatogens have been prepared in an efficient route starting from indoles substituted in position 2. Reduction of the 2-substituted indoles was performed with tin and hydrochloric acid to give racemic indolines, which were converted to isatogens by 3-chloroperoxybenzoic
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
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
Direct Synthesis of Unprotected Indolines Through Intramolecular sp<sup>3</sup> C−H Amination Using Nitroarenes as Aryl Nitrene Precursors
作者:Giedre Sirvinskaite、Celine S. Nardo、Patrick Müller、Aurelio C. Gasser、Bill Morandi
DOI:10.1002/chem.202301978
日期:2023.9.26
benzylic sp3 C−H amination is disclosed using aryl nitro compounds as aryl nitrene precursors. Organosilicon reagent N,N’-bis(trimethylsilyl)-4,4’-bipyridinylidene (Si-DHBP) served as an efficient reductant in the transformation, enabling the in situ generation of aryl nitrene species for the synthesis of 2-arylindolines from the corresponding nitroarene compounds.