Ag NPs decked GO composite as a competent and reusable catalyst for %26apos;ON WATER%26apos; chemoselective synthesis of pyrano[2,3-c:6,5-c %26apos;]dipyrazol]-2-ones

作者：Dandia Anshu; Gupta Shyam L; Indora Aayushi; Saini Pratibha; Parewa Vijay; Rathore Kuldeep S

来源：Tetrahedron Letters, 2017, 58(12): 1170-1175.

DOI：10.1016/j.tetlet.2017.02.014

• Ag NPs/GO composite
• On water synthesis
• Chemoselectivity
• Pyranodipyrazolones

We have synthesized and characterized Ag NPs decked GO composite and studied its role as reusable catalyst for the 'ON WATER' chemoselective synthesis of pyranodipyrazolones via the reaction of different carbonyl compounds with 3-methyl-1-phenyl-1H-pyrazol-5(4H)-one. This method illustrates significant selectivity for pyranodipyrazolones over arylmethylene bispyrazolols and arylmethylenepyrazolones. Synergistic effect of heterogenic nature of water with reactants and Ag NP5/G0 had profuse outcome on reaction as indicated by high TOF (18.03 x 10(-5) mol g(-1) min(-1)). Furthermore, catalyst was recycled for 7-times without significant loss of activity.

• 出版日期2017-3-22