Results 41 to 50 of about 2,457 (204)

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, Sándor Nagy, Zsuzsanna Fehér, Péter Huszthy, József Kupai   +4 more
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D-ribose based organo catalyst for the sustainable synthesis of bioactive biscoumarins

Results in Chemistry
Herein, the reported work includes the design and synthesis of D-ribose containing DABCO (1,4-diazabicyclo[2.2.2]octane) sugar ionic liquid (DD-RSIL) via three steps and employed an organocatalyst for the synthesis of methylene or methine substituted ...
Pavani Yasam, Rajagopal Desikan
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Organocatalytic asymmetric fluorination of α-chloroaldehydes involving kinetic resolution

Beilstein Journal of Organic Chemistry, 2014
In a previous study it was shown that the enantioselective α-fluorination of racemic α-chloroaldehydes with a chiral organocatalyst yielded the corresponding α-chloro-α-fluoroaldehydes with high enantioselectivity.
Kazutaka Shibatomi, Takuya Okimi, Yoshiyuki Abe, Akira Narayama, Nami Nakamura, Seiji Iwasa   +5 more
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Recent advances in synthesizing and utilizing nitrogen-containing heterocycles

Frontiers in Chemistry, 2023
The use of organocatalysts and a pot economy has strengthened recent organic syntheses. Synthetic methodologies may be applicable in laboratory preparation or in the industrial production of valuable organic compounds. In most cases, synthetic challenges
Hyun-Joon Ha
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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, Ravi Kumar, Kotaro Kikushima, Toshifumi Dohi   +3 more
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Asymmetric Synthesis of the Carbon-14-Labeled Selective Glucocorticoid Receptor Modulator using Cinchona Alkaloid Catalyzed Addition of 6-Bromoindole to Ethyl Trifluoropyruvate

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, Masanori Tobe, Tomoko Nakajima, Kazumi Niidome, Masato Sakamoto, Kengo Tojo, Daisuke Urabe, Takaaki Sumiyoshi   +7 more
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A Mild and Regioselective Ring-Opening of Aziridines with Acid Anhydride Using TBD or PS-TBD as a Catalyst

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
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Conformational Analysis and Organocatalytic Activity of Helical Stapled Peptides Containing α-Carbocyclic α,α-Disubstituted α-Amino Acids

Molecules
Conformational freedom-restricted peptides, such as stapled peptides, play a crucial role in the advancement of functional peptide development. We synthesized stapled octapeptides using α-carbocyclic α,α-disubstituted α-amino acids, particularly 3 ...
Akihiro Iyoshi, Atsushi Ueda, Tomohiro Umeno, Takuma Kato, Kazuhiro Hirayama, Mitsunobu Doi, Masakazu Tanaka   +6 more
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Recent applications of chiral calixarenes in asymmetric catalysis

Beilstein Journal of Organic Chemistry, 2018
The use of calixarenes in asymmetric catalysis is receiving increasing attention due to their tunable three-dimensional molecular platforms along with their easy syntheses and versatile modification at the upper and lower rims. This review summarizes the
Mustafa Durmaz, Erkan Halay, Selahattin Bozkurt   +2 more
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2-(5-phenyl-4H-1,2,4-triazol-3-ylthio)acetic acid: Greener and efficient organocatalyst for multicomponent reactions under aqueous media

Current Research in Green and Sustainable Chemistry, 2021
A simple, ecofriendly and competent method is reported for the synthesis of functionalized amines via reductive amination of carbonyl compounds with amines and β-amino ketones via Mannich reaction, using greener and efficient organocatalyst, 2-(5-phenyl ...
Harsha Sharma, Sunny Sharma, Satya Paul
doaj   +1 more source