- Photolytic Studies on the Generation and Trapping of 6-Oxomethylidenecyclohexa-2,4-diene-1-one Derivatives with Various Nucleophiles
-
α-Oxoketenes and cyclohexadiene α-oxoketenes are reactive intermediates, particularly the latter due to their high re-aromatization potential. In this communication, we report photolytic studies on the generation of such species from 4-OMe and 4-OMOM protected resorcylate dioxinones and their trapping to give resorcylate esters and amides as well as the formation of adducts with enol-ethers as trapping reagents.
- Mies, Thomas,White, Andrew J. P.,Parsons, Philip J.,Barrett, Anthony G. M.
-
-
- Stereoselective synthesis of resorcylic acid lactone Cochliomycin B
-
The total synthesis of 14-membered resorcylic acid lactone, Cochliomycin B has prescribed, in a convergent manner, from readily available starting materials, D-galactose, L-aspartic acid and ethyl acetoacetate. The key reactions involved in the synthesis are Julia-Kocienski olefination, E-selective Horner-Wadsworth-Emmons olefination and intramolecular lactonization.
- Nagalatha,Siva Ganesh,Venkat Narsaiah
-
-
- Chemical study on Garhwal Himalayan Lichen: Usnea emidotteries
-
Usnea species are medicinally important, so we take unexplored species, Usnea emidotteris. Seven components 2-hydroxy-3-methoxy-4, 6-dimethyl ethyl benzoate, 2, 4-dihydro-xy-3, 6-dimethyl ethyl benzoate, 2-hydroxy-4-methoxy-3, 6-dimethylbezoic acid, usnic
- Rawat,Shukla, Vertika,Negi, Sandeep,Pant
-
p. 2566 - 2570
(2007/10/03)
-
- Thermal Decomposition of Lichen Depsides
-
The thermal decomposition of the following lichen depsides has been described: lecanoric acid, gyrophoric acid, evernic acid, perlatolic acid, planaic acid, confluentic acid, atranorin, 4-O-demethylbarbatic acid, and sekikaic acid.Main reaction products are decarboxylated compounds, phenolic units, rearranged depsides, and xanthones.Triethylammonium salts of depside carboxylic acids decompose at reasonably lower temperature than the corresponding free acids. - Keywords: Lichen Depsides, Thermal Decomposition
- Huneck, Siegfried,Schmidt, Juergen,Tabacchi, Raffaele
-
p. 1283 - 1289
(2007/10/02)
-
- SELECTIVE INHIBITION OF THE BIOSYNTHESIS OF PENICILLIC ACID
-
5-Chloroorsellinic acid inhibits the formation of penicillic acid by Penicillium cyclopium at sublethal concentrations.
- Lari, Jalil,Thomas, Robert
-
p. 3305 - 3308
(2007/10/02)
-