Results 31 to 40 of about 10,179 (225)
Membrane-Supported Recovery of Homogeneous Organocatalysts: A Review
Chemistry, 2020 As catalysis plays a significant role in the development of economical and sustainable chemical processes, increased attention is paid to the recovery and reuse of high-value catalysts. Although homogeneous catalysts are usually more active and selective
Péter Kisszékelyi +4 more
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Chiral benzimidazoles as hydrogen bonding organocatalysts [PDF]
, 2015 Several bifunctional organocatalysts bearing the benzimidazole unit have been designed in order to act as bifunctional systems by hydrogen bonding. Chiral 2-aminobenzimidazoles are conformational rigid guanidines able to catalyze enantioselectively ...
Nájera, Carmen, Yus, Miguel
core +2 more sources
Towards Tartaric‐Acid‐Derived Asymmetric Organocatalysts [PDF]
European Journal of Organic Chemistry, 2013 AbstractTartaric acid is one of the most prominent naturally occurring chiral compounds. Whereas its application in the production of chiral ligands for metal‐catalysed reactions has been exhaustively investigated, its potential to provide new organocatalysts has been less extensively explored.
Gratzer, Katharina +2 more
openaire +2 more sources
Reactions of nitroalkenes with nitroalkanes or sulfur ylides catalyzed by amine-thiourea bifunctional polymeric organocatalysts [PDF]
, 2011 Non-cross-linked and cross-linked bifunctional polystyrenes bearing both amine and thiourea groups have been synthesized and used as organocatalysts in reactions between nitroalkenes and nitroalkanes or sulfur ylides.
Lu, J, Toy, PH
core +1 more source
Halogen-Induced Controllable Cyclizations as Diverse Heterocycle Synthetic Strategy
Molecules, 2020 In organic synthesis, due to their high electrophilicity and leaving group properties, halogens play pivotal roles in the activation and structural derivations of organic compounds.
Hideyasu China +3 more
doaj +1 more source
Enantioselective Organocatalyzed Michael Addition of Isobutyraldehyde to Maleimides in Aqueous Media
Molecules, 2022 Thiourea was introduced into (R,R)-1,2-diphenylethylenediamine as an organocatalyst to promote the reaction between isobutyraldehydes and maleimides. Enantioselective Michael addition reaction was carried out as an eco-friendly method using water as the ...
Jae Ho Shim +3 more
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Synthesis and Crystal Structure of 1-(3-fluorophenyl)-3-(3,4,5-trimethoxybenzoyl)thiourea [PDF]
, 2011 The title thiourea was synthesized by reaction of 3,4,5-trimethoxybenzoyl isothiocyante with 3-fluoroaniline. The 3,4,5-trimethoxybenzoyl isothiocyante was produced in situ by reaction of 3,4,5-trimethoxybenzoyl chloride with ammonium thiocyanate in dry ...
Bolte, Michael +2 more
core +2 more sources
Molecules, 2012 We describe in this study the asymmetric synthesis of radioisotope (RI)-labeled selective glucocorticoid receptor modulator. This synthesis is based on optimization of the cinchona alkaloid catalyzed addition of 6-bromoindole to ethyl trifluoropyruvate ...
Norie Tsuboya +7 more
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In pursuit of β-amino α-nitro β-trifluoromethyl ketones: nitro-Mannich vs Mannich-type reactions [PDF]
, 2017 The reactivity of alfa-nitro ketones with trifluoromethyl aldimines is studied for the first time. While under nitro-Mannich conditions only the facial stereoselectivity can be controlled, organocatalysed Mannich-type reactions allowed a complete control
Ballini +45 more
core +1 more source
Molecules, 2015 The ring-opening of N-tosylaziridines with various acid anhydrides catalyzed by 5 mol % of 1,5,7-triazabicyclo[4,4,0]dec-5-ene (TBD) afforded the corresponding β-amino esters in excellent yields under mild reaction conditions. Polymer-supported catalyst,
Satoru Matsukawa, Yasutaka Mouri
doaj +1 more source