Results 11 to 20 of about 30,773 (318)

Highly Enantioselective Epoxidation of α,β-Unsaturated Ketones Using Amide-Based Cinchona Alkaloids as Hybrid Phase-Transfer Catalysts

Organic Letters, 2020
A series of 20 one chiral epoxides were obtained with excellent yields (up to 99%) and enantioselectivities (up to >99% ee) using hybrid amide-based Cinchona alkaloids.
Maciej Majdecki, Agata Tyszka-Gumkowska, J. Jurczak   +2 more
semanticscholar   +1 more source

Changes of Cinchona distribution over the past two centuries in the northern Andes

Royal Society Open Science, 2023
The Cinchona genus is important for humanity due to its ethnobotanical properties, and in particular its ability to prevent and treat malaria. However, there have been historical changes of Cinchona distribution in the tropical Andes that remain ...
Carlos E. González-Orozco, Esther García Guillén, Nicolás Cuvi   +2 more
doaj   +1 more source

Stereoselective α-Chlorination of β-Keto Esters in the Presence of Hybrid Amide-Based Cinchona Alkaloids as Catalysts

Journal of Organic Chemistry, 2020
We report an enantioselective phase transfer α-chlorination of β-keto esters catalyzed by hybrid amide-based Cinchona derivatives. The chlorination process proceeds with proper quantitative yields (up to
Maciej Majdecki, Piotr Grodek, J. Jurczak   +2 more
semanticscholar   +1 more source

Phytochemical Composition, Antibacterial, and Antibiotic-Resistance Modulatory Activity of Extracts of Lippia multiflora Moldenke, Terminalia mollis M. A. Lawson, and Cinchona officinalis L. Against Multidrug-Resistant Pseudomonas aeruginosa. [PDF]

Scientifica (Cairo)
Mouozong R, Fankam AG, Diffo VL, Matieta VY, Megaptche FJ, Kuete V.   +5 more
europepmc   +3 more sources

Kompatibilitas Jamur Entomopatogenik Paecilomyces fumosoroseus dengan Beberapa Bahan Aktif Pestisida Secara In Vitro

Jurnal Agro, 2016
Untuk mengurangi penggunaan pestisida di perkebunan teh, maka salah satu upaya pengendalian hama yang dapat dilakukan adalah mengkombinasikan aplikasi pestisida dengan jamur entomopatogenik. Penelitian ini bertujuan untuk mengetahui kompatibilitas antara
Fani Fauziah, Dadan Rohdiana
doaj   +1 more source

Cinchona L. “Árbol de la Quina”

Revista Peruana de Biología, 2020
Este trabajo se centra en las recientes decisiones tomadas por el Ministerio de Agricultura del Perú sobre la recolección, propagación y siembra de especies de quina.
Joaquina Albán-Castillo, Eder Chilquillo, Briggitthe Melchor- Castro, Mónica Arakaki, Blanca León, Mery Suni   +5 more
doaj   +1 more source

Pengaruh Kombinasi Aplikasi Jamur Paecilomyces fumosoroseus, Lem Perangkap, dan Insektisida Imidakloprid terhadap Empoasca sp.

Jurnal Agro, 2017
Untuk memperoleh cara pengendalian yang efektif dan efisien sesuai dengan konsep Pengendalian Hama Terpadu telah dilakukan penelitian efektivitas berbagai kombinasi perlakuan terhadap Empoasca sp. pada tanaman teh.
Fani Fauziah, Odih Sucherman
doaj   +1 more source

How cinchona alkaloid-derived primary amines control asymmetric electrophilic fluorination of cyclic ketones. [PDF]

, 2014
The origin of selectivity in the α-fluorination of cyclic ketones catalyzed by cinchona alkaloid-derived primary amines is determined with density functional calculations.
Houk, KN, Lam, Yu-hong
core   +2 more sources

Smallholder farmers’ knowledge on management of Cinchona in the Democratic Republic of the Congo [PDF]

Plant Ecology and Evolution
Background and aims – Cinchona (Rubiaceae) tree bark is the key source of quinine alkaloids used as malaria treatment. Cinchona trees were introduced to Democratic Republic of the Congo (DRC) in the early 20th century. Currently, the eastern DRC accounts
Bezawit Mekonnen, Landry Cizungu, Julio Alegre, Haben Blondeel, Emiel De Lombaerde, Hans Verbeeck, Luc Duchateau, Eddie Schrevens, Kris Verheyen, Pascal Boeckx, Pieter De Frenne   +10 more
doaj   +3 more sources

Enantioselective Organocatalytic Diels-Alder Trapping of Photochemically Generated Hydroxy-o-Quinodimethanes [PDF]

, 2016
The photoenolization/Diels-Alder strategy offers straightforward access to synthetically valuable benzannulated carbocyclic products. This historical light-triggered process has never before succumbed to efforts to develop an enantioselective catalytic ...
Cuadros, Sara, Dell'Amico, Luca, Melchiorre, Paolo, Vega Pe\uf1aloza, Alberto   +3 more
core   +2 more sources