Stereochemistry and reactivity of F- and H-vinyldiazocarbonyl compounds and their phosphazines: synthesis of pyrazoles and pyridazines
作者:Murat B. Supurgibekov、Valerija M. Zakharova、Jochim Sieler、Valerij A. Nikolaev
DOI:10.1016/j.tetlet.2010.11.073
日期:2011.1
tituted (F) 2-vinyl-2-diazocarbonyl compounds, having cis-relationship of functional groups (AlkO2C, CN2), do not undergo 1,5-electrocyclization, but readily take part in the tandem Staudinger–diaza-Wittig reactions to produce trifluoromethyl-substituted pyridazines, whereas their non-fluorinated analogs (H), with trans-configuration, easily cyclize to pyrazoles, but remain intact under Staudinger–diaza-Wittig
Diazo Strategy for the Synthesis of Pyridazines: Pivotal Impact of the Configuration of the Diazo Precursor on the Process
作者:Valerij A. Nikolaev、David Cantillo、C. Oliver Kappe、Jury J. Medvedev、G. K. Surya. Prakash、Murat B. Supurgibekov
DOI:10.1002/chem.201503448
日期:2016.1.4
vinyldiazocarbonyl compounds having cis stereochemistry of the functional groups on the vinyl bond readily produce pyridazines by a diaza‐Wittig process, whereas their counterparts with trans configuration remain intact under similar reaction conditions. Upon UV irradiation trans‐phosphazenes furnish pyridazines through a tandem trans‐to‐cis isomerization followed by intramolecular cyclization. At elevated temperatures