Results 41 to 50 of about 6,365 (202)

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

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

Electrogenerated NHC as an organocatalyst in the Staudinger reaction

, 2010
Electrogenerated N-heterocyclic carbene can behave as an organocatalyst in the Staudinger reaction (from imine and acyl chloride) in a very polar solvent, such as an ionic ...
ORSINI, MONICA, FEROCI M, CHIAROTTO I, INESI A.   +3 more
core   +2 more sources

Stereoselective Glycosylation of 2-Nitrogalactals Catalyzed by a Bifunctional Organocatalyst [PDF]

, 2016
The use of a bifunctional cinchona/thiourea organocatalyst for the direct and α-stereoselective glycosylation of 2-nitrogalactals is demonstrated for the first time.
Coe, Diane M., Crisenza, Giacomo; id_orcid, Crisenza, Giacomo, Medina, Sandra, Medina Villar, Sandra, McGarrigle, Eoghan M., Galan, Carmen, Miranda Alcazar, Silvia, Harper, Matt, Miranda, Silvia, Harper, Matthew J., Coe, Diane M, Galan, M. Carmen, Balmond, Edward, Balmond, Edward I.   +14 more
core   +2 more sources

Bombyx Mori Silk Fibroin as a Sustainable Organocatalyst for Diastereoselective Michael Additions. [PDF]

ChemSusChem
Powdered silk fibroin (PSF) extracted from Bombyx mori cocoons is reported as a heterogeneous organocatalyst in the selective Michael 1,4 addition of nitromethane to α,β-unsaturated carbonyl compounds, affording Michael adducts in almost quantitative ...
Ricciardelli C, Rizzo G, Cotugno P, Salomone A, Trisciuzzi D, Nicolotti O, Colaprico E, Altomare CD, Farinola GM.   +8 more
europepmc   +2 more sources

Novel Imidazolidine-Tetrazole Organocatalyst for Asymmetric Conjugate Addition of Nitroalkanes

, 2016
The Michael addition of nitroalkanes to α,β-unsaturated enones catalyzed by a novel chiral imidazolidine-2-yltetrazole organocatalyst has been investigated.
Nis Halland (1585213), Karl Anker Jørgensen (1287900), Auxiliadora Prieto (1819057)   +2 more
core   +1 more source

Enantioselective Total Synthesis of Beraprost Using Organocatalyst

, 2017
A convergent and enantioselective total synthesis of the most active isomer of beraprost was achieved in 17 pots. A unique tricyclic core in beraprost was synthesized efficiently by utilizing the asymmetric organocatalyst-mediated formal [3 + 2 ...
Shigenobu Umemiya (1548130), Yujiro Hayashi (467585), Daisuke Sakamoto (1447471), Genki Kawauchi (3775069)   +3 more
core   +1 more source

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
doaj   +1 more source

An efficient proline-based homogeneous organocatalyst with recyclability

, 2018
A homogeneous organocatalyst for asymmetric reduction of imines can be reused for several cycles through a self-assembly method using MNPs.
Yaoxian Li, Zhonglin Wei, Fuquan Bai, Qiang Li, Haifeng Duan, Yingjie Lin, Yuan Li, Jingdong Wang, Qingbiao Yang   +8 more
core   +1 more source

Chemical signal activation of an organocatalyst enables control over soft material formation

, 2017
Cells can react to their environment by changing the activity of enzymes in response to specific chemical signals. Artificial catalysts capable of being activated by chemical signals are rare, but of interest for creating autonomously responsive ...
Fanny Trausel, Jos M. Poolman, Chandan Maity, D. S. J. Kouwenberg, Jan H. van Esch, Rienk Eelkema, Frank Versluis   +6 more
core   +3 more sources