Merging Visible-Light Photoredox and Lewis Acid Catalysis for the Intramolecular Aza-Diels-Alder Reaction: Synthesis of Substituted Chromeno[4,3-<i>b</i>
]quinolines and [1,6]Naphthyridines
Substituted chromeno[4,3‐b]quinolines and [1,6]naphthyridines were achieved by tandem intramolecular aza‐Diels–Alder reaction using a strategy of combination of visible‐light photoredox and Lewis‐acid‐catalysis. This intramolecular aza‐Diels–Alder cycloaddition took place between the in situ generated benzylidene anilines derived from arylamines and salicylaldehyde or 2‐aminoaryl aldehydes bearing
efficient catalyst for intramolecular Povarov reactions. Polycyclic amines containing three contiguous stereogenic centers were obtained with excellent stereocontrol in a single step from secondary anilines and aldehydes possessing a pendent dienophile. These transformations constitute the first examples of catalytic enantioselective intramolecular aza‐Diels–Alder reactions.
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
Aza-Povarov Reaction. A Method for the Synthesis of Fused Tetracyclic Chromeno[4,3-<i>d</i>]pyrido[1,2-<i>a</i>]pyrimidines
作者:Endika Martín-Encinas、Leyre Lopez-Aguileta、Francisco Palacios、Concepción Alonso
DOI:10.1021/acs.joc.3c02220
日期:2024.1.19
with specific structural and stereochemical complexity, allowing access to new potential therapeutic entities. In this work, a new strategy based on the [4 + 2] Povarov reaction involving 1,3-diazadiene was developed. This approach is applied for a straightforward procedure in the preparation of chromeno[4,3-d]pyrido[1,2-a]pyrimidine derivatives, with accessible substrates, 2-aminopyridine and unsaturated
药物发现的基石是制定策略,提供具有特定结构和立体化学复杂性的特殊小分子,从而获得新的潜在治疗实体。在这项工作中,开发了一种基于涉及 1,3-二氮杂二烯的 [4 + 2] Povarov 反应的新策略。该方法适用于制备色并[4,3- d ]吡啶并[1,2- a ]嘧啶衍生物的简单过程,具有可接近的底物、2-氨基吡啶和不饱和醛,以及优异的原子经济性以获得四个稠合环杂环,以区域和非对映选择性方式。