- One-pot synthesis of new 3-substituted coumarins by tandem reactions
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(Chemical Equation Presented) The synthesis of new 3-substituted coumarins appended to imidazolium, pyridinium, 3-dimethylamino pyridinium, 3-chloro pyridinium and 3-bromo pyridinium salts is reported. These salts were prepared by tandem reactions, follow
- Bourahla, Khadidja,Rahmouni, Mustapha,Fraga-Dubreuil, Joan,Bazureau, Jean Pierre,Hamelin, Jack
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- Controlled Release of Nitric Oxide And Drugs From Functionalized Macromers And Oligomers
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The present invention provides NO and, optionally, drug releasing macromers and oligomers wherein the drug molecule and NO releasing moiety are linked an absorbable macromer or oligomeric chain susceptible to hydrolytic degradation and wherein the macrome
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Page/Page column 28
(2012/02/15)
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- Controlled Release of Nitric Oxide And Drugs From Functionalized Macromers And Oligomers
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The present invention provides NO and, optionally, drug releasing macromers and oligomers wherein the drug molecule and NO releasing moiety are linked an absorbable macromer or oligomeric chain susceptible to hydrolytic degradation and wherein the macrome
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- Synthesis of coumarins, 4-hydroxycoumarins, and 4-hydroxyquinolinones by tellurium-triggered cyclizations
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Coumarins, 4-hydroxycoumarins, and 4-hydroxyquinolin-2(1H)-ones can be conveniently prepared by treatment of α-halocarboxylic acid esters of salicylaldehyde, o-hydroxyacetophenone, methyl salicylate, and methyl N-methyl- or N-phenylanthranilates with sodium or lithium telluride. Phenylketene formation competes with cyclization of the α-chlorophenylacetate ester of methyl salicylate as demonstrated by a trapping experiment with benzylamine. Elemental tellurium may be recovered and reused.
- Dittmer, Donald C.,Li, Qun,Avilov, Dimitry V.
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p. 4682 - 4686
(2007/10/03)
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