A synthesis of mono-, di- and tri-substituted pyran-4-ones from isoxazoles is reported. The isoxazoles can be synthesized from readily available starting materials and undergo a reductive cleavage reaction with Mo(CO)6 to generate enaminoketone intermediates, which are then cyclized to pyran-4-ones under acidic conditions.
The cycloadditions of a series of 4H-pyran-4-ones
3c–e with electron-rich dienes 11a,b to give reduced flavones 12
is described. The subsequent reactions of these reduced flavones with
HCl, trifluoroacetic anhydride, ethyl anthranilate 19a and
anthranilonitrile 19b is also described.
Synthetic applications of N–N linked heterocycles. Part 12. The preparation of 4-alkylthio- and 4-arylthio-pyridines by regiospecific attack of thioalkoxide lons on N-(4-oxopyridin-1-yl)pyridinium salts
作者:Michael P. Sammes、Christopher W. F. Leung、Chi Keung Mak、Alan R. Katritzky
DOI:10.1039/p19810001585
日期:——
Thiolate ions add regiospecifically to N-(4-oxopyridin-1-yl)pyridinium salts (2)–(7) to give in good to excellent yields only the 1,4-dihydropyridine adducts (8)–(13), regardless of whether or not the pyridone moiety carries substituents for sterically shielding the 2- and 6-positions of the pyridinium ring. The addition is believed to be thermodynamically controlled. Decomposition of the dihydro-adducts
Reaktionen von 6-Phenyl-4-pyron-2-carbonsäureäthylester mit nucleophilen Reagentien
作者:F. Eiden、M. Beuttenmüller、H. Schaumburg
DOI:10.1002/ardp.19753080704
日期:——
Reaktionenvon 6‐Phenyl‐4‐pyron‐2‐carbonsäureäthylester (2a) mit CH‐aciden Verbindungen oder/und Aminen führten zu Pyranyliden‐(1a–d, 3), Pyridinyliden‐(6, 7), Pyroncarbonsäureämid‐ und Pyridon‐Derivaten (4a–c, 5). Mit Benzylamin entstand aus 2b 1‐Benzyl‐3‐benzylamino‐maleinsäureimid 8a.
Combination of a Cox-2 inhibitor and a DNA topoisomerase I inhibitor for treatment of neoplasia
申请人:Masferrer L. Jaime
公开号:US20050187172A1
公开(公告)日:2005-08-25
The present invention provides combinations of a Cox-2 inhibitor and a DNA topoisomerase inhibitor and methods of use thereof for preventing and/or treating neoplasia or or a neoplasia-related disorder in a subject.