Results 81 to 90 of about 390,408 (384)
Asymmetric catalysis with bifunctional cinchona alkaloid-based urea and thiourea organocatalysts.
Chemical Communications, 2008 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
S. Connon
semanticscholar +1 more source
Organocatalytic C─O Bond Cleavage and Asymmetric Transformations via [1,3]‐Sigmatropic Rearrangement
Advanced Science, EarlyView.A direct asymmetric strategy for fulfilling the functional group transfer by aryl ether cleavage and migration is developed, representing the first Brønsted base‐catalyzed asymmetric [1,3]‐sigmatropic rearrangement reaction. The resulting chiral benzofuran products generated through this strategy exhibit significant 3D‐dimensionality and demonstrate ...
Lei Peng +7 more
wiley +1 more source
Angewandte Chemie, EarlyView.A binary organic–inorganic acid cooperative catalytic system has been developed to achieve highly enantioselective electrochemical oxidative rearrangement of indoles. The use of electricity as an oxidant in this case showed several advantages including environmental benignity and improved enantiocontrol.
Xuefeng Tan +3 more
wiley +2 more sources
A Simple LC–MS Method for the Quantitation of Alkaloids in Endophyte-Infected Perennial Ryegrass
Toxins, 2019 The rapid identification and quantitation of alkaloids produced by Epichloë endophyte-infected pasture grass is important for the agricultural industry.
Simone Vassiliadis +5 more
doaj +1 more source
Asian Journal of Organic Chemistry, EarlyView.A facile synthetic route to (−)‐8a‐epi‐lentiginosine from d‐glucose using the Pd‐BiPhePhos catalyzed intramolecular Tsuji–Trost reaction of non−derivatized allylic alcohol as a key construction of the hydroxylated pyrrolidine ring is reported. The crystal structure of (−)‐8a‐epi‐lentiginosne showed the envelope conformation of the five‐membered ring ...
Sunisa Akkarasamiyo +3 more
wiley +1 more source
Marine Alkaloid 2,2-Bis(6-bromo-3-indolyl) Ethylamine and Its Synthetic Derivatives Inhibit Microbial Biofilms Formation and Disaggregate Developed Biofilms [PDF]
, 2019 The antimicrobial activity of the marine bisindole alkaloid 2,2-bis(6-bromo-3-indolyl) ethylamine (1) and related synthetic analogues (compounds 2–8) against target microorganisms was investigated by Minimum Inhibitory Concentration (MIC) determination ...
Baffone, Wally +3 more
core +1 more source
Asian Journal of Organic Chemistry, EarlyView.An interrupted Barton–Zard reaction/Friedel–Crafts alkylation telescoped reaction provides aryl‐substituted pyrrolo[3,4‐b] cores in moderate‐to‐good yields as mostly single diastereomers. The reaction is tolerant of a wide range of electron‐deficient indoles and (hetero)aromatic nucleophiles, offering a modular approach for the synthesis of multi ...
Josip Rešetar +5 more
wiley +1 more source
Marine Drugs, 2019 Non-melanoma skin cancer is one of the major ailments in the United States. Effective drugs that can cure skin cancers are limited. Moreover, the available drugs have toxic side effects.
Jaden Cowan +5 more
doaj +1 more source
Hazards to golden-mantled ground squirrels and associated secondary hazard potential from strychnine baiting for forest pocket gophers [PDF]
, 1984 Radio telemetry and capture-recapture techniques were used to evaluate the hazards to golden-mantled ground squirrels (Spermophilus lateralis) from hand baiting with 0.5% strychnine-treated oats for western pocket gophers (Thomomys mazama) on conifer ...
Anthony, R. Michael +2 more
core
Biosynthesis of the protoberberine alkaloid jatrorrhizine [PDF]
, 1983 Feeding experiments with distant single or doubly labelled precursors show that the methylene dioxy group of berberine is opened in the formation of ...
Beecher +8 more
core +1 more source