Synthesis of 1,2,4-Triazole<i>C</i>-Nucleosides from Hydrazonyl Chlorides and Nitriles
作者:Najim A. Al-Masoudi、Yaseen A. Al-Soud、Ibrahim A. I. Ali
DOI:10.1080/15257770601052265
日期:2007.1
synthesized via the intermolecular cyclization of hydrazonylchlorides with peracylated ribofuranosyl cyanide catalyzed by Yb(OTf)3 or AgNO3, respectively. Similarly, the 1,2,4-triazole of glucopyranosyl C-nucleosides 5a,b were prepared from the hydrazonylchlorides and the nitrile 4. Alternatively, the 1,2,4-triazole N-nucleoside 8 was obtained from cyclization of the unsymmetrical bis[alpha-(4-me
A Library Synthesis of Pyrazoles by Azomethine Imine Cycloaddition to the Polymer-supported Vinylsulfone
作者:Nobuhiro Fuchi、Takayuki Doi、Takashi Takahashi
DOI:10.1246/cl.2005.438
日期:2005.3
1,3-Dipolar cycloaddition of azomethine imines to the polymer-supported vinylsulfone was achieved. Pyrazole derivatives bearing various aryl groups were synthesized regioselectively.
Exploiting the Electrophilic and Nucleophilic Dual Role of Nitrile Imines: One-Pot, Three-Component Synthesis of Furo[2,3-<i>d</i>]pyridazin-4(5<i>H</i>)-ones
作者:Mariateresa Giustiniano、Valentina Mercalli、Jussara Amato、Ettore Novellino、Gian Cesare Tron
DOI:10.1021/acs.orglett.5b01798
日期:2015.8.21
An expeditious multicomponent reaction to synthesize tetrasubstituted furo[2,3-d]pyridazin-4(5H)-ones is reported. In brief, hydrazonoyl chlorides react with isocyanoacetamides, in the presence of TEA, to give 1,3-oxazol-2-hydrazones which, without being isolated, can react with dimethylacetylene dicarboxylate to afford furo[2,3-d]pyridazin-4(5H)-ones with an unprecedented level of complexity in a triple domino Diels-Alder/retro-Diels-Alder/lactamization reaction sequence.
Cecchi; Colotta; Filacchioni, Farmaco, Edizione Scientifica, 1987, vol. 42, # 5, p. 671 - 680