Organocatalytic Asymmetric (3+3) Cycloaddition of 4‐Hydroxycoumarins with α,β‐Unsaturated Aryl Esters
Sign Up to like & getrecommendations! Published in 2025 at "ChemCatChem"
DOI: 10.1002/cctc.202401925
Abstract: Chiral six‐membered O‐heterocycle‐fused coumarins belong to one of the most important chiral O‐heterocycles, which are found in many natural products and bioactive molecules. Therefore, developing catalytic asymmetric strategies for the construction of chiral six‐membered O‐heterocycle‐fused… read more here.
Keywords: heterocycle fused; six membered; fused coumarins; membered heterocycle ... See more keywords
Multicomponent Reactions of Arylglyoxal, 4-Hydroxycoumarin, and Cyclic 1,3-C,N-Binucleophiles: Binucleophile Directed Synthesis of Fused Five and Six Membered N-Heterocycles
Sign Up to like & getrecommendations! Published in 2017 at "European Journal of Organic Chemistry"
DOI: 10.1002/ejoc.201700115
Abstract: The multicomponent reaction (MCR) of arylglyoxal, 4-hydroxycoumarin, and various cyclic 1,3-C,N-binucleophiles in acetic acid under microwave conditions provides fused five- or six- membered N-heterocycles depending on the ring size of the binucleophiles. 1,3-C,N-binucleophiles, such as… read more here.
Keywords: six membered; cyclic binucleophiles; membered heterocycles; fused five ... See more keywords
Construction of Sulfur(IV)‐Chiral Six‐Membered Heterocycles by Pd‐Catalyzed Asymmetric (4+2) Dipolar Cyclization
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DOI: 10.1002/ejoc.202401007
Abstract: Chiral sulfur‐containing compounds play an important role in asymmetric catalysis and synthesis, chiral pharmaceuticals, and chiral materials. While great progress has been made in the synthesis of these compounds, the asymmetric catalytic synthesis of chiral… read more here.
Keywords: six membered; membered heterocycles; synthesis; catalyzed asymmetric ... See more keywords
Ring Size Dependent Lactam‐Lactim Tautomeric Equilibrium in Imidazolin‐2‐Chalcogenones and Pyrimidin‐2‐Chalcogenones: A Role of Aromaticity
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DOI: 10.1002/jcc.70177
Abstract: The dynamic nature of tautomerism has profound implications for structure, function, and reactivity of biologically important molecules. This study investigates the effect of ring size and aromaticity on tautomeric stability of Imidazolin‐2‐chalcogenones and Pyrimidin‐2‐chalcogenones using… read more here.
Keywords: six membered; ring size; imidazolin chalcogenones; pyrimidin chalcogenones ... See more keywords
Application of cyclohexane-1,3-diones for six-membered oxygen-containing heterocycles synthesis.
Sign Up to like & getrecommendations! Published in 2020 at "Bioorganic chemistry"
DOI: 10.1016/j.bioorg.2020.104559
Abstract: Cyclohexan-1,3-dione derivatives are versatile scaffolds for the synthesis of a variety of value-added organic molecules including heterocycles and natural products. Six-membered oxygen heterocycles prepared from cyclohexan-1,3-diones are of much importance as they are intermediate for… read more here.
Keywords: dione derivatives; membered oxygen; six membered; chemistry ... See more keywords
Hydrolysis mechanism of double six–membered ring pentaborate anion
Sign Up to like & getrecommendations! Published in 2020 at "Chemical Physics Letters"
DOI: 10.1016/j.cplett.2019.136930
Abstract: Abstract DFT-based calculations show that B5O6(OH)4- forms B5O5(OH)6− intermediate during the first step of hydrolysis. Then, the hydrolysis pathways are divided to principal and secondary reactions. In the principal reaction, hydrolysis occurs at the bridge… read more here.
Keywords: membered ring; six membered; occurs bridge; mechanism double ... See more keywords
A bis(arylphosphinito)amide pincer ligand that binds nickel forming six-membered metallacycles
Sign Up to like & getrecommendations! Published in 2020 at "Polyhedron"
DOI: 10.1016/j.poly.2020.114380
Abstract: Abstract The synthesis of a bis(arylphosphinito)amide pincer ligand P2ONO− designed to form two six-membered rings upon metallation is reported. Phosphination of a known bis(phenolato)amide ONO3− scaffold led to isolation of two isomers: the intended H(P2ONO)… read more here.
Keywords: six membered; amide pincer; bis arylphosphinito; pincer ligand ... See more keywords
Asymmetric one-pot synthesis of five- and six-membered lactones via dynamic covalent kinetic resolution: Exploring the regio- and stereoselectivities of lipase
Sign Up to like & getrecommendations! Published in 2019 at "Tetrahedron Letters"
DOI: 10.1016/j.tetlet.2019.02.030
Abstract: Abstract Cascade lipase-catalyzed lactonization has been applied to dynamic hemithioacetal formation, leading to efficient five- and six-membered lactone synthesis as well as chiral discrimination. Solvent-dependent regioselectivity was observed for the selective formation of 1,3-oxathiolan-5-one and… read more here.
Keywords: five six; six membered; pot synthesis; one pot ... See more keywords
Six-Membered Saturated NHC-Stabilized Borenium Cations: Isolation of a Cationic Analogue of Borinic Acid.
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DOI: 10.1021/acs.inorgchem.2c00611
Abstract: The reaction of six-membered saturated NHC [1,3-di(2,6-diisopropylphenyl) tetrahydropyrimidine-2-ylidene; henceforth abbreviated as 6-SIDipp] with PhBCl2 yields a Lewis base adduct, 6-SIDipp·PhBCl2 (1), which readily undergoes nucleophilic substitution reaction with AgNO3, leading to the single (2) and… read more here.
Keywords: saturated nhc; borenium; acid; six membered ... See more keywords
Controlled Access to Four- and Six-Membered Palladacycles via Modifying Donor Abilities of β-Ketiminato Ligands ("NacAcs").
Sign Up to like & getrecommendations! Published in 2022 at "Inorganic chemistry"
DOI: 10.1021/acs.inorgchem.2c03515
Abstract: The synthesis of Pd complexes of the type [PdBr(iPr2-bimy)(NacAc)] (NacAc = β-ketiminate, iPr2-bimy = 1,3-diisopropylbenzimidazolin-2-ylidene) was attempted, in a continuing effort to quantify donor abilities of chelating β-ketiminate ligands using the Huynh electronic parameter for… read more here.
Keywords: donor abilities; membered palladacycles; controlled access; six membered ... See more keywords
Boundaries of the Hyperconjugation from π-Extended Six-Membered Phosphorus Heterocycles.
Sign Up to like & getrecommendations! Published in 2023 at "Inorganic chemistry"
DOI: 10.1021/acs.inorgchem.2c03884
Abstract: In the context of materials science, six-membered phosphorus heterocycles are intriguing building blocks due to their tunable properties through phosphorus post-functionalization and their unique hyperconjugative effects arising from the phosphorus substituents that contribute to further… read more here.
Keywords: phosphorus; phosphorus heterocycles; six membered; membered phosphorus ... See more keywords