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
We have developed a highly efficient and practical strategy for the kinetic resolution of indoline derivatives, involving a chiral Brønstedacid-catalyzed iminium ion formation and asymmetric transfer hydrogenation cascade process. The kinetic resolution allows the synthesis of 2-substituted N-benzylindolines in good yields with moderate to excellent enantioselectivities.
Novel Two-Step Synthesis of N-Alkylated 2,3-Diaryl-4-quinolones
作者:Alexander V. Aksenov、Nikolai A. Arutiunov、Anna M. Zatsepilina、Anna A. Aksenova、Elena V. Aleksandrova、Nicolai A. Aksenov、Alexander V. Leontiev、Dmitrii A. Aksenov
DOI:10.1055/s-0042-1751530
日期:2024.2
polysubstituted 4-quinolones was conveniently prepared via simple and practical protocol involving N-alkylation of 2-(3-oxoindolin-2-yl)acetonitriles and following NaH-induced ring expansion. The current two-step approach provides feasible access to a subclass of N-protected C3-aryl-substituted 2-phenyl-4-quinolones starting with or just one step away from commercially available 2-arylindoles and nitrostyrenes
通过简单实用的方案,包括2-(3-氧代吲哚啉-2-基)乙腈的N-烷基化以及 NaH 诱导的扩环,可以方便地制备 18 种多取代的 4-喹诺酮文库。目前的两步法提供了一种可行的方法,从市售的2-芳基吲哚和硝基苯乙烯开始或仅一步之遥,即可获得N-保护的C3-芳基取代的2-苯基-4-喹诺酮亚类。