作者:Jalal A. Zahra、Bassam A. Abu Thaher、Mustafa M. El-Abadelah、Roland Boese
DOI:10.1039/b211458p
日期:2003.2.27
In the presence of triethylamine, 2-mercaptobenzoic acid readily adds onto acylhydrazonoyl chlorides (1a–c)
(precursors of the reactive nitrile imine 1,3-dipolar species) to afford good yields of the corresponding 2-[(2-oxo-1-arylhydrazonopropan-1-yl)mercapto]benzoic acids (2a–c). The latter acyclic adducts, in THF in the presence of 1,1′-carbonyldiimidazole, undergo intramolecular cyclization involving the activated carboxy and the enol functionality to deliver the respective 2-(N-arylhydrazono)-3-oxobenzothiophenes (3a–c). In the solid state, the latter compounds adopt the (Z)-geometry around the CN double bond as evidenced by single crystal X-ray structure determination for 3b.
在三乙胺的存在下,2-巯基苯甲酸很容易与酰基肼酮氯化物(1a–c)(反应性腈亚胺1,3-偶极子中间体的前体)加成,得到了相应的2-[(2-氧-1-芳基肼酮丙基-1-基)巯基]苯甲酸(2a–c)的良好产率。后者的非环状加成物在THF中与1,1'-碳酰二咪唑存在下发生分子内环化,涉及活化的羧基和烯醇功能团,生成相应的2-(N-芳基肼酮)-3-氧基苯并噻吩(3a–c)。在固态下,后者化合物在CN双键周围采用(Z)几何构型,3b的单晶X射线结构测定证明了这一点。