Synthesis and properties of new heterocyclic betaines: 4-Aryl-5-(methoxycarbonyl)-2-oxo-3-(pyridin-1-ium-1-yl)-2,3-dihydro-1 H -pyrrol-3-ides
作者:Liya D. Funt、Mikhail S. Novikov、Galina L. Starova、Alexander F. Khlebnikov
DOI:10.1016/j.tet.2018.03.071
日期:2018.5
3-dihydro-1H-pyrrol-3-ides, were synthesized in good yields by the reaction of alkyl 2H-azirine-2-carboxylates with 2-methoxy-2-oxo-1-(pyridin-1-ium-1-yl)ethan-1-ides, generated from the corresponding pyridinium salts. The betaines exist as the NH-tautomers both in solution and in the solid state. Two molecules of the betaine form a dimer by hydrogen bonds of the type NH⋯O in solid state. According to TD DFT
合成了新的杂环甜菜碱,4-芳基-5-(烷氧基羰基)-2-氧代-3-(吡啶-1-基-1-基)-2,3-二氢-1 H-吡咯-3-化物。通过由相应的吡啶鎓盐生成的2 H-叠氮基-2-羧酸烷基酯与2-甲氧基-2-氧代-1-(吡啶-1-基-1-基)乙氧基-1-化合物反应,可得到良好的收率。甜菜碱以NH-互变异构体的形式存在于溶液中和处于固态。甜菜碱的两个分子通过N型氢键形成二聚体固态的HO。根据TD DFT计算,甜菜碱中的长波吸收带主要对应于带负电荷的吡咯单元与带正电荷的吡啶鎓基团之间的分子内电荷转移。质子溶剂中长波吸收的蓝移已根据与分子骨架亲核中心形成的H络合物进行了充分描述。