[EN] PROCESS FOR THE PURIFICATION OF A MIXTURE COMPRISING N-ALKYL-HYDROXYLAMMONIUM SALTS [FR] PROCÉDÉ DE PURIFICATION D'UN MÉLANGE COMPRENANT DES SELS DE N-ALKYL-HYDROXYLAMMONIUM
Controlling Selectivity for Cycloadditions of Nitrones and Alkenes Tethered by Benzimidazoles: Combining Experiment and Theory
作者:Liping Meng、Selina C. Wang、James C. Fettinger、Mark J. Kurth、Dean J. Tantillo
DOI:10.1002/ejoc.200801211
日期:2009.4
Herein we describe a combined experimental/theoretical study on the effects of substituents on regio- and stereoselectivity in intramolecular 1,3-dipolar cycloadditions of nitrones and alkenestethered by benzimidazoles. By employing a large substituent at position R2 or R3, complete selectivity was achieved for either the fused or bridged cycloadduct, respectively. In addition, these cycloadducts
作者:Evelina Colacino、Pierrick Nun、Francesco Maria Colacino、Jean Martinez、Frédéric Lamaty
DOI:10.1016/j.tet.2008.03.091
日期:2008.6
13C MAS nuclear magnetic resonance experiments. We have also studied the temperature profile during the reaction. A comparative study with the corresponding solvent-free microwave activated reaction showed the superiority of the ball-milling method; 31 examples are described, including the synthesis of the anti-aging agent C-phenyl-N-tert-butyl nitrone (PBN) and one of its analogues C-2-pyridyl-N-tert-butylnitrone
1,5-Diaryl-3-substituted pyrazoles pharmaceutical compositions and use
申请人:Ortho Pharmaceutical Corporation
公开号:US04826868A1
公开(公告)日:1989-05-02
1,5-Diaryl-3-substituted pyrazoles, a method of their preparation, compositions containing the same and methods of their use are disclosed. The pyrazoles are useful in alleviating inflammatory and cardiovascular disorders in mammals.
An asymmetric pericyclic cascade approach to 3-alkyl-3-aryloxindoles: generality, applications and mechanistic investigations
作者:Edward Richmond、Kenneth B. Ling、Nicolas Duguet、Lois B. Manton、Nihan Çelebi-Ölçüm、Yu-Hong Lam、Sezen Alsancak、Alexandra M. Z. Slawin、K. N. Houk、Andrew D. Smith
DOI:10.1039/c4ob02526a
日期:——
The reaction of l-serine derived N-arylnitrones with alkylarylketenes generates 3-alkyl-3-aryloxindoles in good yields and excellent enantioselectivities.
Iridium-Catalyzed Direct C–H Sulfamidation of Aryl Nitrones with Sulfonyl Azides at Room Temperature
作者:Chao Pi、Xiuling Cui、Yangjie Wu
DOI:10.1021/acs.joc.5b01377
日期:2015.8.7
Ir(III)-catalyzed direct C–H sulfamidation of aryl nitrones has been developed to synthesize various sulfamidated nitrones in moderate to excellent yields with excellent regioselectivity and broad functional group tolerance. This transformation could proceed smoothly at roomtemperature with low catalyst loading in the absence of external oxidants, acids, or bases. Molecular nitrogen was released as