Metal-free phosphonation of heteroarene N-oxides with trialkyl phosphite at room temperature
作者:Ming-Tao Chen、Xia You、Li-Gang Bai、Qun-Li Luo
DOI:10.1039/c7ob00402h
日期:——
A new protocol is described for the conversion of heteroarene N-oxides to heteroarylphosphonates through in situ activation with bromotrichloromethane. The N-oxides of isoquinoline, quinoline, quinoxaline and 1,10-phenanthroline were fast transformed into the corresponding heteroarylphosphonates in up to 92% yield under mild conditions in the absence of solvent and metal catalysts. The good functional
Dealkylation Reaction of Acetals, Phosphonate, and Phosphate Esters with Chlorotrimethylsilane/Metal Halide Reagent in Acetonitrile, and Its Application to the Synthesis of Phosphonic Acids and Vinyl Phosphates
A mild and efficient method has been developed for carbon-oxygen bond cleavage using chlorotrimethylsilane/sodium iodide in acetonitrile. It was applied to synthetic transformation undernonaqueous and neutral conditions, such as acetal deprotection and the synthesis of phosphonic acids from the corresponding dialkyl phosphonates via methanolysis of their silyl esters. Effectiveness of various kinds
已经开发出一种在乙腈中使用三甲基氯硅烷/碘化钠进行碳氧键断裂的温和有效的方法。它被应用于非水和中性条件下的合成转化,如缩醛脱保护和从相应的膦酸二烷基酯通过其甲硅烷基酯的甲醇分解合成膦酸。通过 1 H NMR 在乙腈溶液中检测了各种金属碘化物或碘化铵对此类脱烷基作用的有效性。用碘化锂或碘化钾代替碘化钠也获得了令人满意的结果。然而,铜(I)或碘化季铵是无效的。乙腈中的氯三甲基硅烷/溴化锂对多功能膦酸酯或二烷基乙烯基磷酸酯的选择性脱烷基作用有效。
SURFACE-MEDIATED SOLID PHASE REACTIONS: MICROWAVE ASSISTED ARBUZOV REARRANGEMENT ON THE SOLID SURFACE
作者:B. Kaboudin、M. S. Balakrishna
DOI:10.1081/scc-100105324
日期:2001.1
Microwave assisted Arbuzov rearrangement under solvent-free condition was found to be an efficient method for the preparation of dialkyl alkylphosphonates of alkyl halides. This method is an easy, rapid, and high-yielding reaction for the Arbuzov rearrangement.
Reaction of dialkylphosphonates with zirconium salts in acidic aqueous media provides a facile route to crystalline hybrid zirconium phosphonate materials.
二烷基膦酸酯与锆盐在酸性水相介质中反应,提供了一种简便的途径以获得晶态杂化锆膦酸盐材料。
Heterocyclic compound
申请人:Nishi Takahide
公开号:US20080113961A1
公开(公告)日:2008-05-15
A compound having immunosuppressive activity with low toxicity or a pharmacological salt thereof. The compound has a general formula (I) shown below or a pharmacologically acceptable salt thereof, or a pharmacologically acceptable prodrug thereof