Thallium(III) Salts Mediated Oxidative Cyclization of Arenecarbaldehyde Benzothiazol-2-ylhydrazones to Bridged Head Nitrogen Heterocycles
作者:Om V. Singh、Varughese George
DOI:10.1080/00397919408010575
日期:1994.10
arenecarbaldehydebenzothiazol-2-ylhydrazones (4) with thallium (III) acetate in refluxing acetic acid, thallium (III) acetate and thallium (III) nitrate in acetonitrile in presence of p-toluene sulphonic acid afforded 3-aryl-1,2,4-triazolo[3,4-b]benzothiazoles (6) by intramolecular cyclization in high yield. A mechanistic scheme for this transformation has been proposed.
摘要 芳烃甲醛苯并噻唑-2-基腙 (4) 与乙酸铊 (III) 在回流乙酸中、乙酸铊 (III) 和硝酸铊 (III) 在乙腈中在对甲苯磺酸存在下氧化得到 3-芳基-1, 2,4-三唑并[3,4-b]苯并噻唑 (6) 通过分子内环化以高产率获得。已经提出了这种转变的机制方案。