Synthesis of [<sup>18</sup>F]Fluoroarenes by Nucleophilic Radiofluorination of<i>N</i>-Arylsydnones
作者:Maruthi Kumar Narayanam、Gaoyuan Ma、Pier Alexandre Champagne、Kendall N. Houk、Jennifer M. Murphy
DOI:10.1002/anie.201707274
日期:2017.10.9
Easy to handle: A practical radiofluorination of anilines with [18F]fluoride is achieved via N-arylsydnone intermediates. This method displays broad functional group tolerance, is compatible to automation on a commercial radiosynthesis module and can facilitate rapid 18F-labeling of peptides.
Syntheses of heterocyclic compounds. Part XVIII. Aminolysis of 3-aryl-4-bromosydnones, and acid hydrolysis of 3-arylsydnoneimines
作者:G. S. Puranik、H. Suschitzky
DOI:10.1039/j39670001006
日期:——
various 3-aryl- and 3-heteroaryl-4-bromosydnones with piperidine gives the corresponding piperidino-glycyl-piperidines. Fluorine labelling has confirmed the postulated course of fission induced by acids in 3-aryl-sydnoneimines.
The Efficient Synthesis of 3-Arylsydnones Under Neutral Conditions
作者:Jacqueline Applegate、Kenneth Turnbull
DOI:10.1055/s-1988-27791
日期:——
Various substituted aryl sydnones can be prepared in high yield under mild, neutral conditions by nitrosation of the appropriate aryl glycine with isoamyl nitrite in dimethoxyethane followed by cyclization with trifluoroacetic anhydride.
Acylation of Sydnones with Acetic Anhydride in the Presence of Montmorillonite K-10
作者:Kenneth Turnbull、Jones C. George
DOI:10.1080/00397919608004593
日期:1996.7
Abstract Various 4-acetyl sydnones 2 can be prepared in good yield by reaction of the corresponding 3-arylsydnones (cf. 1) with acetic anhydride at ∼ 110°C catalyzed by Montmorillonite K-10. The reaction fails where an ortho-keto moiety is present; therein sydnone ring cleavage occurs to form the corresponding indazole 3.
Catalytic Activity of 1,3-Dibromo-5,5-dimethylhydantoin (DBH) in the One-Pot Transformation of<i>N</i>-Arylglycines to<i>N</i>-Arylsydnones in the Presence of NaNO<sub>2</sub>/Ac<sub>2</sub>O under Neutral Conditions: Subsequent Bromination of these Sydnones to their 4-Bromo Derivatives
作者:Davood Azarifar、Hassan Ghasemnejad-Bosra
DOI:10.1055/s-2006-926380
日期:——
1,3-Dibromo-5,5-dimethylhydantoin (DBH) has been found to efficiently catalyze the one-pot conversion of various N-arylglycines through N-nitrosation and cyclization to sydnones in combination with NaNO2 and Ac2O in high yields (80-94%) under mild and neutral conditions. Also, it was shown that DBH can conveniently promote the bromination of these sydnones to their 4-bromo substituted congeners in excellent yields in DMF at room temperature.