Interception of photochemical intermediate of thiazole derivatives. Formation and isomeristion of iminoazetine and azetinone intermediates
作者:Hiroshi Kato、Kozo Wakao、Akira Yamada、Masanobu Kojima
DOI:10.1039/c39840001558
日期:——
Irradiation of 4-aminothiazolium salts (7) in the presence of tributylphosphine gave enaminonitriles 9) and benzoylacetonotrile (8) by isomerisation and hydration of the iminoazetine intermediates (11), while a similar irradiation of the mesoionic triphenylthiazolium-4-oate (1) gave the quinolinol (5) by isomerisation of the azetione intermediate (3).
substituted benzenediazonium tetraphenylborates to form 1,2,4,3λ4-triazaborines or 1,3,2λ4-oxazaborines. The formation of either the first or the second product is affected by the reaction conditions, especially by the presence of water in the reaction components and in the solvent. If the reaction is performed under anhydrous conditions, the major product is the triazaborine. When ‘wet’ diazoniumsalts are