Results 71 to 80 of about 6,365 (202)

Physicochemical Characterization and Asymmetric Catalytic Properties of New Biobased Organocatalytic Surfactants

Molecules
In organic synthesis, the solvent is the chemical compound that represents the largest proportion of the process. However, conventional solvents are often toxic and dangerous for the environment, and an interesting alternative is to replace them by water.
Elliot Calbrix, Pascale de Caro, Sophie Thiebaud-Roux, Christine Cecutti, Emeline Vedrenne   +4 more
doaj   +1 more source

Catalytic asymmetric formal synthesis of beraprost

Beilstein Journal of Organic Chemistry, 2015
The first catalytic asymmetric synthesis of the key intermediate for beraprost has been achieved through an enantioselective intramolecular oxa-Michael reaction of an α,β-unsaturated amide mediated by a newly developed benzothiadiazine catalyst.
Yusuke Kobayashi, Ryuta Kuramoto, Yoshiji Takemoto   +2 more
doaj   +1 more source

Perfluoroalkanesulfonamide Organocatalysts for Asymmetric Conjugate Additions of Branched Aldehydes to Vinyl Sulfones

Molecules, 2013
Asymmetric conjugate additions of branched aldehydes to vinyl sulfones promoted by sulfonamide organocatalyst 6 or 7 have been developed, allowing facile synthesis of the corresponding adducts with all-carbon quaternary stereocenters in excellent yields ...
Kosuke Nakashima, Miho Murahashi, Hiroki Yuasa, Mariko Ina, Norihiro Tada, Akichika Itoh, Shin-ichi Hirashima, Yuji Koseki, Tsuyoshi Miura   +8 more
doaj   +1 more source

6,7-Dimethoxy-3-methoxycarbonyl-1-(2-methoxyphenyl)-3,4-dihydroisoquinoline 2-oxide

Acta Crystallographica Section E, 2011
In the title compound, C20H21NO6, an N-oxide-based organocatalyst, the N-containing six-membered ring adopts a twisted half-chair conformation. No hydrogen bonding or π–π stacking was found within the crystal structure.
Tricia Naicker, Thavendran Govender, Hendrik G. Kruger, Glenn E. M. Maguire   +3 more
doaj   +1 more source

Magnetic nanoparticle-supported glutathione: a conceptually sustainable organocatalyst

, 2009
A conceptually novel nanoparticle-supported and magnetically recoverable organocatalyst has been developed, which is readily prepared from inexpensive starting materials in a truly sustainable manner; which catalyzes the Paal–Knorr reaction with high ...
Baruwati, Babita, Polshettiwar, Vivek, Varma, Rajender S.   +2 more
core   +1 more source

Use of Novel Homochiral Thioureas Camphor Derived as Asymmetric Organocatalysts in the Stereoselective Formation of Glycosidic Bonds

Molecules
We synthesized six new camphor-derived homochiral thioureas 1–6, from commercially available (1R)-(−)-camphorquinone. These new compounds 1–6 were evaluated as asymmetric organocatalysts in the stereoselective formation of glycosidic bonds, with 2,3,4,6 ...
Mildred López, Gabriela Huelgas, Mario Sánchez, Adalid Armenta, Angel Mendoza, José Daniel Lozada-Ramírez, Cecilia Anaya de Parrodi   +6 more
doaj   +1 more source

A chiral ion-pair photoredox organocatalyst: enantioselective anti-Markovnikov hydroetherification of alkenols

, 2017
A chiral ion-pair photoredox organocatalyst was reported to facilitate visible-light-meditated asymmetric anti-Markovnikov hydroetherification of alkenols with high reactivity and moderate enantioselectivity.
Zhongbo Yang, Sanzhong Luo, Ming-Tian Zhang, Sujia Li, Han Li   +4 more
core   +1 more source

Direct Asymmetric Aldol Reaction with Recyclable Fluorous Organocatalyst

, 2016
Direct asymmetric aldol reactions of aldehydes with ketones in the presence of a catalytic amount of fluorous sulfonamide 4 and trifluoroacetic acid result in the corresponding aldol products in high yields with up to 96% ee.
Tsuyoshi Miura (1997776), Mariko Ina (2308525), Akichika Itoh (1447492), Norihiro Tada (411587), Nobuyuki Imai (2308528), Kie Imai (2308531)   +5 more
core   +1 more source

Probing Electronic Effects Upon Nucleophilicity and Lewis Basicity of Isothiourea HyperBTM Catalyst Derivatives

ChemistryEurope
Isothioureas have become a cornerstone of modern Lewis base organocatalysis being involved in a plethora of applications ranging from large scale syntheses to enantioselective reactions to immobilised catalysts.
Kevin Kasten, Andreas Eitzinger, Lotte Stockhammer, Joanne Dunne, Lukas S. Vogl, Zhanyu Zhou, Mario Waser, Armin R. Ofial, Andrew D. Smith   +8 more
doaj   +1 more source

SPECIFIC “IONIC LIQUIDS” AS NEW ORGANOCATALYSTS OF BIGINELLI REACTION [PDF]

Chemistry Journal of Moldova: General, Industrial and Ecological Chemistry, 2008
New ionic liquids bearing an imidazolium core with a carboxy group have been prepared in an attempt to design new organocatalysts of Biginelli reaction. Trends in the properties of these compounds are discussed.
Viorica Sargarovschi, Eugenia Styngach, Fliur Macaev   +2 more
doaj