La Química médica en el desarrollo de las Sociedades. Biodiversidad y Productos naturales

This document has been prepared by the IUPAC Medicinal Chemistry section and is backed by a large number of scientists, many of whom have had direct involve-ment and whose names appear at the end of the article. This work discusses the role that the discovery of new medicinal agents has in the development of societies as well as in the conservation of biodiversity in terms of the work carried out on natural products. Also included are several recommendations for countries which are presently in search of their own scientific and technological development in medicinal agents. The IUPAC Medicinal Chemistry section would appreciate the collaboration of the scientific societies in every country to aid in the diffusion of this document.Se presenta un documento de opinión elaborado por la sección de Medicinal Chemistry de IUPAC, que cuenta además con el acuerdo de un buen número de científi-cos, algunos de los cuales figuran al final del trabajo. Se plantea el papel que puede tener el descubrimiento de medicamentos en el desarrollo de las sociedades y mantenimiento de la biodiversidad en base a los trabajos en productos naturales. Se plantean recomendaciones de aplicación en los países que están en la bús-queda de su desarrollo científico y tecnológico en el medicamento. Es intención de la sección de Medicinal Chemistry de IUPAC su difusión inter-nacional, por lo que agradecen la colaboración de las sociedades científicas de los dife-rentes países

<span style="font-size:12.0pt;font-family: "Times New Roman";mso-fareast-font-family:"Times New Roman";mso-ansi-language: EN-GB;mso-fareast-language:EN-US;mso-bidi-language:AR-SA" lang="EN-GB">Stereoselective bioreduction of chalcone and β-diketone by <i style="mso-bidi-font-style:normal">Saccharomyces cerevisiae</i> in biphasic solvent system: A mechanistic study</span>

992-1001<span style="font-size:12.0pt;font-family: " times="" new="" roman";mso-fareast-font-family:"times="" roman";mso-ansi-language:="" en-gb;mso-fareast-language:en-us;mso-bidi-language:ar-sa"="" lang="EN-GB">&nbsp;A mechanistic study of steroselective bio-reduction of chalcones and β-diketones to their corresponding hydroxy derivatives with an effective and versatile biocatalyst <i style="mso-bidi-font-style: normal">i.e. Saccharomyces cerevisiae (Baker’s yeast) in different biphasic solvents systems have been carried out. Maximum bioreduction was observed in pet. ether-water (60% v/v), chloroform-water (60% v/v) for compound (R)-3-(5-chloro-2-hydroxyphenyl)-3-hydroxyl-1-phenylpropane-1-one 2a and (R)-3-(5-methyl-2-hydroxyphenyl)-3-hydroxyl-1-phenylpropane-1-one 2b, respectively while ethanol-water (80%v/v) for 4-chloro-2- ((R, <i style="mso-bidi-font-style: normal">E)-1-hydroxy-3-phenyl allyl) phenol <b style="mso-bidi-font-weight: normal">4a. These biphasic systems are instrumental in integrating bioconversion and product recovery in a single system and shifting the chemical equilibrium to enhance yield and selectivity.</span

Synthesis and antimicrobial activity of 5-(2-aminothiazol-4-yl)-3, 4-dihydro-4-phenyl pyrimidin-2(1<i style="">H</i>)-one

1732-1737A series of hybrid 5-(2-aminothiazol-4-yl)-3,4-dihydro-4-phenyl pyrimidin-2(1H)-ones (ATDPP) are reported. Efficient cyclocondensation of appropriately substituted 5-(2-bromoacetyl)-3,4-dihydro-4-phenylpyrimidine-2(1H)-ones (BADPP) with thiourea in ethanol proceeds in high yield to furnish the corresponding ATDPPs. Dihydropyrimidine carboxylates (DHPMS) and their bromo derivatives are the key substrates for cyclocondensation. The ATDPPS revealed biological activity as antimicrobial and antifungal agents against S. aureus, P. aurogenosa, K. pneumonae and C. albicans.</i

Experimental and computational evaluation of new quinolinyl chalcones as potent antiplasmodial agents

1780-1793 In a search for new antiplasmodial agents, a series of thirty five diversely substituted chalcones derived from a quinoline-chalcone scaffold e.g. (E)-3-(2-chloroquinolin-3-yl)-1-(2-hydroxyphenyl) prop-2-en-1-one / (E)-(2-chloro-6-ethoxyquinolin-3-yl) (2-hydroxyphenyl) prop-2-en-1-one and (2Z)-3-(2-chloroquinolin-3-yl)-1-(2-hydroxyphenyl)-3-iodoprop-2-en-1-one are synthesized and studied. Compounds are prepared via Claisen–Schmidt condensations of 2-chloro-3-formyl quinoline / 2-chloro-6-ethoxy-3-formyl quinoline with appropriately substituted 2-hydroxy acetophenones. All compounds are assayed for their binding in the active sites of Plasmodium falciparum lactate dehydrogenase (pfLDH) enzyme. The quinoline chalcone derivatives showed negative binding energies promising potent pfLDH inhibitory activity. Compounds showing the highest negative binding scores have been studied for their in vitro antimalarial activity against cultured Plasmodium falciparum 3D7 strain. The compounds 2c and 2u have completely inhibited the maturation of parasites at MIC 10 µg/mL and above whereas 3b inhibited 95% maturation of parasites at MIC 50 µg/mL. Additional efforts are being directed towards elaborating these leads towards the discovery and development of new quinolinyl heterocycles as anti-malarial agents. </smarttagtype

Sustainable Flow Oppenauer Oxidation of Secondary Benzylic Alcohols with a Heterogeneous Zirconia Catalyst

A flow chemistry process for the Oppenauer oxidation of benzylic secondary alcohols using partially hydrated zirconium oxide and a simple carbonyl containing oxidant such as acetone, cyclohexanone, and neopentanal is reported. The heterogeneous oxidative system could be applied to a wide range of functionalized alcohol substrates, allowing clean and fast delivery of ketone products within a few minutes between 40 and 100 °C

ChemInform Abstract: Experimental and Computational Evaluation of New Quinolinyl Chalcones as Potent Antiplasmodial Agents.

1780-1793 In a search for new antiplasmodial agents, a series of thirty five diversely substituted chalcones derived from a quinoline-chalcone scaffold e.g. (E)-3-(2-chloroquinolin-3-yl)-1-(2-hydroxyphenyl) prop-2-en-1-one / (E)-(2-chloro-6-ethoxyquinolin-3-yl) (2-hydroxyphenyl) prop-2-en-1-one and (2Z)-3-(2-chloroquinolin-3-yl)-1-(2-hydroxyphenyl)-3-iodoprop-2-en-1-one are synthesized and studied. Compounds are prepared via Claisen–Schmidt condensations of 2-chloro-3-formyl quinoline / 2-chloro-6-ethoxy-3-formyl quinoline with appropriately substituted 2-hydroxy acetophenones. All compounds are assayed for their binding in the active sites of Plasmodium falciparum lactate dehydrogenase (pfLDH) enzyme. The quinoline chalcone derivatives showed negative binding energies promising potent pfLDH inhibitory activity. Compounds showing the highest negative binding scores have been studied for their in vitro antimalarial activity against cultured Plasmodium falciparum 3D7 strain. The compounds 2c and 2u have completely inhibited the maturation of parasites at MIC 10 µg/mL and above whereas 3b inhibited 95% maturation of parasites at MIC 50 µg/mL. Additional efforts are being directed towards elaborating these leads towards the discovery and development of new quinolinyl heterocycles as anti-malarial agents. </smarttagtype

Some Studies on Dicyclohexylammonium Hydridoundecacarbonyltriferate

The salt [CxNH2][HFe3(CO)11]·OEt2 (Cx = cyclohexyl, Et = ethyl) was isolated from Cx2NBBr2/Na2Fe2(CO)8/Et2O and was shown by X-ray diffraction (monoclinic, P21/a: a = 17.449(5), b = 16.345(5), c =13.466(4) Å, β = 118.45(2)0, Z = 4) to contain the expected Cx2NH+2 and HFe3(CO)-11 ions as well as the diethyl ether. In each Cx2NH+2 cation one hydrogen atom is hydrogen bonded to the bridging CO oxygen of the HFe3(CO)11 anion whereas the other hydrogen atom is hydrogen bonded to the diethyl ether. The Mössbauer effect spectral parameters (δ, ΔEQ, Γ, area ratios) of [Cx2NH2][HFe3(CO)11] at 295 and 78 K are closely related to those of Fe3(CO)12. © 1991

A novel and simple asymmetric synthesis of CMI-977 (LDP-977): A potent anti-asthmatic drug lead

A practical gram scale asymmetric synthesis of CMI-977 is described. A tandem double elimination of an α-chlorooxirane and concomitant intramolecular nucleophilic substitution was used as the key step. Jacobsen hydrolytic kinetic resolution and Sharpless asymmetric epoxidation protocols were applied for the execution of the synthesis of the key chiral building block