Reactions of Monohalomethyl Aryl Ketoximes with Tetrasulfur Tetranitride: Much Improved Synthesis of 3-Aryl-1,2,5-thiadiazoles
摘要:
Reactions of chloromethyl aryl ketoximes (1, X = Cl) with tetrasulfur tetranitride in p-dioxane at reflux for 4 h afforded 3-aryl-1,2,5-thiadiazoles (2) in 37-92% yields, whereas those of bromo analogs under the same conditions gave 2 and 3-aryl-4-bromo-1,2,5-thiadiazoles (3) in 48-81% and 17-31% yields, respectively. However, the compounds (3) were not formed in the presence of pyridine. Alpha-nitrosostyrene and its ring-substituted derivatives (4) are proposed as intermediates for the formations of 2.
Band gap control in conjugated oligomers and polymers via Lewis acids
申请人:Bazan Guillermo C.
公开号:US20110028656A1
公开(公告)日:2011-02-03
A method for altering the electronic and optical properties of a chemical compound having a band gap and a framework that includes π-delocalized electrons. The method includes complexing a Lewis acid to a basic site within the framework to form a Lewis acid adduct having a band gap that differs from the band gap of the chemical compound. The λ
max
of the Lewis acid adduct can be shifted to a longer wavelength in comparison to the λ
max
of the chemical compound. In various versions, the chemical compound can be a conjugated oligomer, a conjugated polymer, or a small molecule comprising a conjugated π-electron system. Electronic devices that include Lewis acid adducts are also provided.
[EN] PHENYLSULFONAMIDE-SUBSTITUTED, PYRAZOLO[1, 5-A]PYRIMIDINES, METHODS FOR PREPARATION AND USES THEREOF<br/>[FR] PYRAZOLO[1,5-A]PYRIMIDINES SUBSTITUÉES PAR PHÉNYLSULFONAMIDE, LEURS PROCÉDÉS DE PRÉPARATION ET LEURS UTILISATIONS
申请人:WYETH CORP
公开号:WO2009111260A1
公开(公告)日:2009-09-11
Phenylsulfonamide substituted, pyrazolo[1,5-a]pyrimidines are described. The compounds of the invention selectively inhibit Raf kinase activity and are useful for treating disorders associated with Raf kinases. Formula (I)
Bridged, Bicyclic Heterocyclic or Spiro Bicyclic Heterocyclic Derivatives of Pyrazolo[1, 5-A]Pyrimidines, Methods for Preparation and Uses Thereof
申请人:Levin Jeremy Ian
公开号:US20100029657A1
公开(公告)日:2010-02-04
Compounds of formula A:
and pharmaceutically acceptable salts thereof are described, which selectively inhibit Raf kinase activity and are useful for treating disorders mediated by Raf kinases.