α-diketones and β-diketones react with Grignard reagents in the presence of a catalytic amount of Cp2TiCl2 to yield a-ketols and corresponding ketones respectively. Sulfoxides can be deoxygenated by Cp2TiCl2/Al syst...α-diketones and β-diketones react with Grignard reagents in the presence of a catalytic amount of Cp2TiCl2 to yield a-ketols and corresponding ketones respectively. Sulfoxides can be deoxygenated by Cp2TiCl2/Al system. The possible mechanisms are also discussed.展开更多
基金Project (No. 20072033) supported by the National Natural Science Foundation of China and the Specialized Research Fund for the Doctoral Program of Higher Education Ministry, China
文摘α-diketones and β-diketones react with Grignard reagents in the presence of a catalytic amount of Cp2TiCl2 to yield a-ketols and corresponding ketones respectively. Sulfoxides can be deoxygenated by Cp2TiCl2/Al system. The possible mechanisms are also discussed.
文摘研究中药白头翁主要活性成分白头翁皂苷(PULC)对类风湿性关节炎(rheumatoid arthritis,RA)模型大鼠Me CP2表达的调控作用。采用佐剂性关节炎大鼠为RA模型,原代培养RA模型大鼠滑膜成纤维细胞样滑膜细胞(FLS),Real time q PCR,Western blotting检测100 mg·kg-1PULC灌胃治疗对RA模型大鼠FLS Me CP2表达的调控作用,MTT检测PULC治疗对FLS增殖的影响,Me CP2 siRNA干扰RA模型大鼠FLS Me CP2表达后SFRP2,β-catenin表达的变化。检测发现经100mg·kg-1PULC灌胃治疗后,RA模型大鼠FLS中Me CP2表达明显降低,SFRP2表达升高,RA模型大鼠FLS增殖活力降低,Me CP2 siRNA抑制RA模型大鼠FLS Me CP2表达后,SFRP2表达明显上调,β-catenin表达明显降低。PULC可能通过抑制Me CP2表达上调SFRP2表达,抑制RA模型大鼠滑膜Wnt通路活性,抑制RA模型大鼠滑膜异常增殖。