作者:Mohamed T. Omar、Nadia K. El-Asar、Khaled F. Saied
DOI:10.1055/s-2001-11440
日期:——
A variety of 3,5-disubstituted-2,3-dihydro-2-thioxothieno[2,3-d]thiazoles 3 a - h including alkyl-, aryl- and heteryl-substituents were synthesized in excellent yields in a one pot reaction between 3-substituted-5-(2-aryl (or heteryl)-2-oxoethyl)-4-oxo-2-thioxo-1,3-thiazolidines 1 a - h and either tetraphosphorous decasulfide (Method A) or Lawesson's reagent (Method B). However, fair yields of 3 were also obtained along with unknown oily products when the (E,Z)-5-(2-aryl-2-oxoethylidene) derivatives 2 f,g were similarly treated with the same reagents. Structures of products were supported by microanalytical and spectral evidence. A rationalization for the route of conversion is given.
多种3,5-二取代-2,3-二氢-2-硫代噻吩[2,3-d]噻唑(3a-h),包括烷基、芳基和杂原子取代基,在优选的产率中通过一步反应合成了3-取代-5-(2-芳基(或杂原子)-2-氧代乙基)-4-氧代-2-硫代-1,3-噻唑烷(1a-h)与四磷酸十硫化物(方法A)或Lawesson试剂(方法B)的反应。然而,当(E,Z)-5-(2-芳基-2-氧代亚乙基)衍生物(2f,g)在与相同试剂反应时,也能得到相当产率的3以及未知油状产物。产物的结构得到了微观分析和光谱证据的支持。为转化的途径提供了合理的解释。