Enantioselective Synthesis of Spiroindenes by Enol-Directed Rhodium(III)-Catalyzed C-H Functionalization and Spiroannulation. [PDF]
Angew Chem Int Ed Engl, 2015 Chirale Cp‐Rhodium‐Komplexe vermitteln die enantioselektive Enol‐dirigierte C(sp2)‐H‐Funktionalisierung und oxidative Anellierung mit Alkinen unter Bildung von Spiroindenen mit quartären Kohlenstoff‐Stereozentren. Entscheidend für hohe ee‐Werte sind offenbar eine hohe Selektivität zwischen zwei dirigierenden Gruppen sowie die Kontrolle der ...
Reddy Chidipudi S +3 more
europepmc +7 more sources
Ruthenium‐Catalyzed Decarboxylative Rearrangement of 4‐Alkenyl‐isoxazol‐5‐ones to Pyrrole Derivatives [PDF]
European Journal of Organic Chemistry, Volume 2022, Issue 25, July 7, 2022., 2022 Easily accessible isoxazol‐5(4H)‐ones are useful precursors of different heterocycles. In this work, the ruthenium‐catalyzed transformation of 4‐alkenyl‐substituted isoxazol‐5‐ones to 1H‐pyrrole derivatives is reported. Abstract Easily accessible isoxazol‐5(4H)‐ones are useful precursors of heterocycles.
Letizia Molteni +6 more
wiley +3 more sources
Aniline Derivatives from Lignin under Mild Conditions Enabled by Electrochemistry [PDF]
ChemSusChem, Volume 17, Issue 3, February 8, 2024.Electrochemical oxidation of lignin‐derived guaiacols & syringols leads to cyclohexadienone intermediates in moderate to good yields. These react with ethyl glycinate hydrochloride under mild conditions to afford lignin‐based anilines. This methodology can be incorporated to reductive catalytic fractionation processes towards selective obtention of 4 ...
Antonio A. Castillo‐Garcia +3 more
wiley +3 more sources
From Conventional to Sustainable Catalytic Approaches for Heterocycles Synthesis [PDF]
ChemSusChem, Volume 17, Issue 8, April 22, 2024.Catalysed synthetic methods, such as transition metals, organocatalysts, photocatalysts, iodine‐catalysed reaction, electrochemical reactions and green innovative methods are of great interest for the sustainable synthesis of heterocyclic compounds, important building blocks for several applications.
Carla Rizzo +4 more
wiley +3 more sources
Enantioselective palladium-catalyzed C(sp2)-C(sp2) σ bond activation of cyclopropenones by merging desymmetrization and (3 + 2) spiroannulation with cyclic 1,3-diketones. [PDF]
Chem Sci, 2021 Zhou HQ +7 more
europepmc +3 more sources
Diastereoselective spiroannulation of phenolic derivatives: Effect of steric hindrance on the diastereoselectivity. [PDF]
, 2010 The objective of this study was to determine the effect, if any, that steric factors have on the oxidative spiroannulation of simple phenols bearing substituents that are increasing in size.
Lyndia M. Susag
openalex +4 more sources
Dearomatization of Halonaphthols via an Intermolecular [4＋1] Spiroannulation with in situ Formed Aza-ortho-quinone Methides [PDF]
Chinese Journal of Organic Chemistry, 2023 Xiaofeng
exaly +2 more sources
Stereoselective N ‐Heterocyclic‐Carbene‐Catalyzed Spiroannulation as an Access Towards Spirobenzofuranone‐Fused Cyclohexenones [PDF]
Advanced Synthesis &Catalysis, Volume 366, Issue 24, Page 5008-5014, December 17, 2024.Abstract In this work, we present an organocatalytic spiroannulation method that provides access to spirocyclic benzofuran‐2‐ones. The reaction proceeds via the generation of an azolium dienolate from an α‐bromo‐α,β‐unsaturated aldehyde using a chiral N‐heterocyclic carbene, followed by annulation with benzofuran‐2‐one‐derived alkenes.
Ladislav Lóška +8 more
openalex +2 more sources
A C1-symmetric N-heterocyclic carbene catalysed oxidative spiroannulation of isatin-derived enals: highly enantioselective synthesis of spirooxindole δ-lactones. [PDF]
RSC Adv, 2018 Lin JB +5 more
europepmc +3 more sources
Rh(iii)-catalyzed spiroannulation of 3-arylquinoxalin-2(1H)-ones with alkynes: practical access to spiroquinoxalinones. [PDF]
RSC Adv, 2020 Zhang Y +6 more
europepmc +3 more sources