Swedish
Albanian
Arabic
Armenian
Azerbaijani
Belarusian
Bengali
Bosnian
Catalan
Czech
Danish
Deutsch
Dutch
English
Estonian
Finnish
Français
Greek
Haitian Creole
Hebrew
Hindi
Hungarian
Icelandic
Indonesian
Irish
Italian
Japanese
Korean
Latvian
Lithuanian
Macedonian
Mongolian
Norwegian
Persian
Polish
Portuguese
Romanian
Russian
Serbian
Slovak
Slovenian
Spanish
Swahili
Swedish
Turkish
Ukrainian
Vietnamese
Български
中文(简体)
中文(繁體)

cinchona/urea

Länken sparas på Urklipp
ArtiklarKliniska testerPatent
8 resultat
Two novel diastereomeric cinchona-calixarene hybrid-type receptors (SOs) were synthesized by inter-linking 9-amino(9-deoxy)-quinine (AQN)/9-amino(9-deoxy)-epiquinine (eAQN) and a calix[4]arene scaffold via an urea functional unit. Silica-supported chiral stationary phases (CSPs) derived from these
The enantioselective Conia-ene cyclization of alkyne-tethered β-ketoesters is efficiently catalyzed by the combination of cinchona-derived amino-urea pre-catalysts and copper(I) salts. The reaction scope is broad and a series of substrates can be efficiently cyclized with high yields and
The first class of bifunctional cinchona-alkaloid catalysts incorporating a urea moiety at C-5' has been developed. These materials catalyze the efficient and highly enantioselective 1,2-addition of nitromethane to trifluoromethylketones to form synthetically pliable products incorporating a

Asymmetric catalysis with bifunctional cinchona alkaloid-based urea and thiourea organocatalysts.

Endast registrerade användare kan översätta artiklar
Logga in Bli medlem
Cinchona alkaloid derivatives modified to include a (thio)urea component have emerged in the last three years as readily accessible, robust and tunable bifunctional organocatalysts for a range of synthetically useful transformations. The origins of these catalysts and the major developments in their

Cinchona Urea-Catalyzed Asymmetric Sulfa-Michael Reactions: The Brønsted Acid-Hydrogen Bonding Model.

Endast registrerade användare kan översätta artiklar
Logga in Bli medlem
The cinchona alkaloid-derived urea-catalyzed asymmetric conjugate addition of aromatic thiols to cycloalkenones was studied using density functional theory (DFT). Deprotonation of the thiol gives a protonated amine that activates the electrophile by Brønsted acid catalysis, while the urea group

Cinchona Alkaloid Catalyzed Sulfa-Michael Addition Reactions Leading to Enantiopure β-Functionalized Cysteines.

Endast registrerade användare kan översätta artiklar
Logga in Bli medlem
Sulfa-Michael additions to α,β-unsaturated N-acylated oxazolidin-2-ones and related α,β-unsaturated α-amino acid derivatives have been enantioselectively catalyzed by Cinchona alkaloids functionalized with a hydrogen bond donating group at the C6' position. The series of Cinchona alkaloids includes
The mechanism of the enantioselective sulfa-Michael addition reaction catalyzed by a cinchona alkaloid-squaramide bifunctional organocatalyst was studied using density functional theory (DFT). Four possible modes of dual activation mechanism via hydrogen bonds were considered. Our study showed that
Gå med på vår
facebook-sida

Den mest kompletta databasen med medicinska örter som stöds av vetenskapen

  • Fungerar på 55 språk
  • Växtbaserade botemedel som stöds av vetenskap
  • Örter igenkänning av bild
  • Interaktiv GPS-karta - märka örter på plats (kommer snart)
  • Läs vetenskapliga publikationer relaterade till din sökning
  • Sök efter medicinska örter efter deras effekter
  • Organisera dina intressen och håll dig uppdaterad med nyheterna, kliniska prövningar och patent

Skriv ett symptom eller en sjukdom och läs om örter som kan hjälpa, skriv en ört och se sjukdomar och symtom den används mot.
* All information baseras på publicerad vetenskaplig forskning

Google Play badgeApp Store badge