• Herein, we described the synthesis of SBA-16 supported cinchona alkaloid ligand and tested it for the osmium catalyzed AD reaction of olefins to diols, a key reaction in organic synthesis. (thefreelibrary.com)
  • The first complete synthesis of an alkaloid was achieved in 1886 by the German chemist Albert Ladenburg. (wikipedia.org)
  • The influence of the particle size of the obtained powders on the recovery of analytes in extracts of Cinchona bark was investigated using HPLC. (worldwidescience.org)
  • Extracts from plants containing toxic alkaloids, such as aconitine and tubocurarine, were used since antiquity for poisoning arrows. (wikipedia.org)
  • Preparation of mesoporous SBA-16 silica-supported biscinchona alkaloid ligand for the asymmetric dihydroxylation of olefins. (thefreelibrary.com)
  • Our interest in the field led us to prepare SBA-16 silica-supported biscinchona alkaloid for osmium-catalyzed asymmetric dihydroxylation (AD) of olefins. (thefreelibrary.com)
  • Among these types of catalysis is the asymmetric phase-transfer catalysis (APTC) which has used quaternary ammonium salts with defined stereogenic centers of asymmetric induction in organic compounds, for example, the salts (l) and (2) of alkaloids ephedra and (3) and (4) of the Cinchona [8] (Figure 1) have been used frequently and conducted at good results in terms of stereoselectivity, especially when the substituents in the quaternary nitrogen are bulky. (thefreelibrary.com)
  • This article reviews the applications of cinchona alkaloids as asymmetric catalysts. (worldwidescience.org)
  • Since a relative short period (about 50 years) chemist have also used these alkaloids as chiral catalyst for a wide variety of asymmetric transformations. (worldwidescience.org)
  • Alkaloids are a class of basic, naturally occurring organic compounds that contain at least one nitrogen atom. (wikipedia.org)
  • Some synthetic compounds of similar structure may also be termed alkaloids. (wikipedia.org)
  • The boundary between alkaloids and other nitrogen-containing natural compounds is not clear-cut. (wikipedia.org)
  • Natural compounds containing nitrogen in the exocyclic position (mescaline, serotonin, dopamine, etc.) are usually classified as amines rather than as alkaloids. (wikipedia.org)
  • Alkaloids are a class of naturally occurring organic compounds that mostly contain basic nitrogen atoms. (wikipedia.org)
  • Purpose: To evaluate the local anesthetic and antipyretic activities of an aqueous extract of Cinchona officinalis (C. officinalis) in experimental animal models. (worldwidescience.org)
  • Alkaloids have a wide range of pharmacological activities including antimalarial (e.g. quinine), antiasthma (e.g. ephedrine), anticancer (e.g. homoharringtonine), cholinomimetic (e.g. galantamine), vasodilatory (e.g. vincamine), antiarrhythmic (e.g. quinidine), analgesic (e.g. morphine), antibacterial (e.g. chelerythrine), and antihyperglycemic activities (e.g. piperine). (wikipedia.org)
  • It is unique in Cinchona by having the combination of elliptic leaf blades glossy above, distinct circular pit domatia at secondary vein axils, basipetally dehiscent capsules. (worldwidescience.org)
  • The antipyretic properties of cinchona barks were known since ancient times in South America, particularly in Peru. (worldwidescience.org)
  • Alkaloid-containing plants have been used by humans since ancient times for therapeutic and recreational purposes. (wikipedia.org)
  • Alkaloids are produced by a large variety of organisms including bacteria, fungi, plants, and animals. (wikipedia.org)
  • Chapter 7 describes the development of an effective grinding device for the grinding of herbal samples such as Cinchona barks. (worldwidescience.org)
  • A significant contribution to the chemistry of alkaloids in the early years of its development was made by the French researchers Pierre Joseph Pelletier and Joseph Bienaim√© Caventou, who discovered quinine (1820) and strychnine (1818). (wikipedia.org)
  • The development of the chemistry of alkaloids was accelerated by the emergence of spectroscopic and chromatographic methods in the 20th century, so that by 2008 more than 12,000 alkaloids had been identified. (wikipedia.org)
  • The use of these barks in medicines against "fevers" in Europe in the 17th century made the exploitation of cinchonas of Peru a highly productive process, and those cinchona trees became menaced. (worldwidescience.org)
  • Cinchona alkaloids have a long history as being a powerful medicine against malaria. (worldwidescience.org)
  • Other alkaloids possess psychotropic (e.g. psilocin) and stimulant activities (e.g. cocaine, caffeine, nicotine, theobromine), and have been used in entheogenic rituals or as recreational drugs. (wikipedia.org)