3-芳基四唑吡啶鎓盐与硫酚盐反应,得到稳定的芳硫基取代吡啶鎓N-芳基酰亚胺两性离子,为红色晶体。角熔融的四唑并[1,5- a ]喹啉鎓盐类似地反应,并且还产生蓝色的两性离子产物。新的两性离子在甲醇中进行溶剂分解,得到N-苯胺基吡啶酮,它们的烷基化生成稳定的N-烷基取代的盐,并且它们与双极性亲和剂反应导致形成稳定的环加合物。
3-芳基四唑吡啶鎓盐与硫酚盐反应,得到稳定的芳硫基取代吡啶鎓N-芳基酰亚胺两性离子,为红色晶体。角熔融的四唑并[1,5- a ]喹啉鎓盐类似地反应,并且还产生蓝色的两性离子产物。新的两性离子在甲醇中进行溶剂分解,得到N-苯胺基吡啶酮,它们的烷基化生成稳定的N-烷基取代的盐,并且它们与双极性亲和剂反应导致形成稳定的环加合物。
5-b]pyridinium salts (1), participate in 1,3-dipolar cycloaddition with aryl isothiocyanates and aryl isocyanates to result in formation of fused thioxo- and oxo[1,2,4]triazolium salts (5 and 12), respectively. This transformation is interpreted as a regular 1,3-cycloaddition followed by spontaneous elimination of the aryl- or benzylsulfanyl group. Formation of these triazolium salts can be followedunder
2-芳硫基吡啶基和苄基硫基吡啶鎓N-芳基酰亚胺(2),可轻松从四唑并[1,5- b ]吡啶鎓盐(1)中获得,与芳基异硫氰酸酯和芳基异氰酸酯一起参与1,3-偶极环加成反应,从而形成稠合的硫代[1,2,4]三唑鎓盐和氧代[1,2,4]三唑鎓盐(分别为5和12)。该转化被解释为常规的1,3-环加成,然后自发消除芳基-或苄基硫烷基。这些三唑鎓盐的形成可在适当的反应条件下通过开环反应进行,以提供一些新的三唑基烯基(6)。沿着路径1 → 5识别硫醇根阴离子的中间参与,使得可以简化一个简单的步骤至5,暗示串联反应序列。
Formation of new pyridyl substituted enamines. Observation of a diaza-Cope rearrangement
the starting pyridinium compound on the reagent, which is followed by a [3,3]-sigmatropic (‘diaza-Cope’) rearrangement. Ring opening of the pyrrolopyridine compounds by a base also yielded pyridylenamines, which proved to be positional isomers of the sigmatropic rearrangement products. The new pyridyl derivatives seem to be valuable compounds for further transformations. Thus, they can undergo thermal
2-Arylsulfanyl and 2-benzylsulfanylpyridinium N-arylimides (2) easily prepared from 3-aryltetrazolopyridinium salts (1) with aryl and benzylthiolates, respectively, reacted with various dipolarophiles yielding cycloadducts that underwent transformation to give tetrahydropyrrolo[3,2-b]pyridines (5, 6, and 8) in good yields. A similar rearrangement (formation of 15) was also observed in the case of parent derivatives being unsubstituted in position 2 (12). The abscence of any significant solvent effect, comparison of the sulfur and non-sulfur analogues, as well as the stereoselective nature of the observed ring transformation seem to support a sigmatropic mechanism. Structure elucidation of the products has been carried out by single-crystal X-ray diffraction and H-1 NMR experiments.
Synthesis of new stable arylthiopyridinium N-arylimide zwitterions. Part 20: Fused azolium salts
3-Aryltetrazolopyridinium salts react with thiophenolates to afford stable arylthio substituted pyridinium N-arylimide zwitterions as red crystals. The angularly fused tetrazolo[1,5-a]quinolinium salt react analogously and also yielded a blue zwitterionic product. The new zwitterions underwent solvolysis in methanol to give N-anilinopyridones, their alkylation yielding stable N-alkyl substituted salts
3-芳基四唑吡啶鎓盐与硫酚盐反应,得到稳定的芳硫基取代吡啶鎓N-芳基酰亚胺两性离子,为红色晶体。角熔融的四唑并[1,5- a ]喹啉鎓盐类似地反应,并且还产生蓝色的两性离子产物。新的两性离子在甲醇中进行溶剂分解,得到N-苯胺基吡啶酮,它们的烷基化生成稳定的N-烷基取代的盐,并且它们与双极性亲和剂反应导致形成稳定的环加合物。