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