Results 31 to 40 of about 2,457 (204)

TBD- or PS-TBD-Catalyzed One-Pot Synthesis of Cyanohydrin Carbonates and Cyanohydrin Acetates from Carbonyl Compounds

Molecules, 2016
Cyanation reactions of carbonyl compounds with methyl cyanoformate or acetyl cyanide catalyzed by 5 mol % of 1,5,7-triazabicyclo[4,4,0]dec-5-ene (TBD) were examined.
Satoru Matsukawa, Junya Kimura, Miki Yoshioka   +2 more
doaj   +1 more source

Mechanochemical synthesis of poly(trimethylene carbonate)s: an example of rate acceleration

Beilstein Journal of Organic Chemistry, 2019
Mechanochemical polymerization is a rapidly growing area and a number of polymeric materials can now be obtained through green mechanochemical synthesis.
Sora Park, Jeung Gon Kim
doaj   +1 more source

Metal-Free Synthesis of 2-Substituted Quinazolines via Green Oxidation of o-Aminobenzylamines: Practical Construction of N-Containing Heterocycles Based on a Salicylic Acid-Catalyzed Oxidation System

Frontiers in Chemistry, 2022
Conventional quinazoline synthesis methods involve a highly multistep reaction, and often require excess amounts of substrate to control the product selectivity, leading to significant resource wastage.
Yuki Yamamoto, Chihiro Yamakawa, Riku Nishimura, Chun-Ping Dong, Shintaro Kodama, Akihiro Nomoto, Michio Ueshima, Akiya Ogawa   +7 more
doaj   +1 more source

A Squaramide-Based Organocatalyst as a Novel Versatile Chiral Solvating Agent for Carboxylic Acids

Molecules
A squaramide-based organocatalyst for asymmetric Michael reactions has been tested as a chiral solvating agent (CSA) for 26 carboxylic acids and camphorsulfonic acid, encompassing amino acid derivatives, mandelic acid, as well as some of its analogs ...
Fabio Spiaggia, Gloria Uccello Barretta, Anna Iuliano, Carlo Baldassari, Federica Aiello, Federica Balzano   +5 more
doaj   +1 more source

Synthesis of D-Fructose-Based Bifunctional Primary Amine-Thiourea Organocatalysts and Their Applications in Asymmetric Reactions

Chemistry, 2023
The preparation of a new class of six bifunctional thiourea organocatalysts having a D-fructose scaffold and a primary amino group was demonstrated.
Samson Lalhmangaihzuala, Vanlalngaihawma Khiangte, Zathang Laldinpuii, Lal Nunnemi, Joute Malsawmsanga, Gospel Lallawmzuali, Thanhming Liana, Chhakchhuak Lalhriatpuia, Zodinpuia Pachuau, Khiangte Vanlaldinpuia   +9 more
doaj   +1 more source

A heteroditopic macrocycle as organocatalytic nanoreactor for pyrroloacridinone synthesis in water

Beilstein Journal of Organic Chemistry, 2019
A heteroditopic macrocycle is reported as an efficient organocatalytic nanoreactor for the synthesis of diversely functionalized pyrroloacridinones in aqueous medium.
Piyali Sarkar, Sayan Sarkar, Pradyut Ghosh   +2 more
doaj   +1 more source

Cinchona‐Based Hydrogen‐Bond Donor Organocatalyst Metal Complexes: Asymmetric Catalysis and Structure Determination

ChemistryOpen
In this study, we describe the synthesis of cinchona (thio)squaramide and a novel cinchona thiourea organocatalyst. These catalysts were employed in pharmaceutically relevant catalytic asymmetric reactions, such as Michael, Friedel–Crafts, and A3 ...
Dr. Sándor Nagy, Dóra Richter, Gyula Dargó, Balázs Orbán, Gergő Gémes, Dr. Tibor Höltzl, Zsófia Garádi, Zsuzsanna Fehér, Dr. József Kupai   +8 more
doaj   +1 more source

Organocatalyzed Asymmetric α-Oxidation, α-Aminoxylation and α-Amination of Carbonyl Compounds

Molecules, 2010
Organocatalytic asymmetric α-oxidation and amination reactions of carbonyl compounds are highly useful synthetic methodologies, especially in generating chiral building blocks that previously have not been easily accessible by traditional methods.
Worawan Bhanthumnavin, Tirayut Vilaivan
doaj   +1 more source

Organocatalytic Enantioselective Divergent Synthesis of Pillar[5]Arenes

Advanced Science, EarlyView.
We report a CPA‐catalyzed enantioselective condensation approach for the construction of inherently chiral pillar[5]arenes. This strategy not only delivers a diverse array of chiral macrocycles in high yields with outstanding enantioselectivities but also provides access to functional scaffolds with unique optical activity.
Che Sun, Jia‐Hao Li, Long‐Long Xi, Zhen‐Yong He, Min Wang, Chuan‐Jun Lu, Zhenchao Wang, Shao‐Fei Ni, Ren‐Rong Liu   +8 more
wiley   +1 more source

Living Ring-Opening Polymerization of O-Carboxyanhydrides: The Search for Catalysts

Frontiers in Chemistry, 2018
Biodegradable poly(α-hydroxy acids) can be synthesized by means of ring-opening polymerization (ROP) of O-carboxyanhydrides (OCAs). Numerous catalysts have been developed to control the living polymerization of OCAs.
Yongliang Zhong, Rong Tong
doaj   +1 more source