Synthesis of Novel Pyridinium Betaine Precursors from exo-Norbornene Dicarboximides
作者:Julia V. Hernandez-Madrigal、Armando Pineda-Contreras、Oscar F. Vazquez-Vuelvas、Mikhail A. Tlenkopatchev、Hector Garcia-Ortega、Ruben Gavino-Ramirez、Zeferino Gomez-Sandoval
DOI:10.2174/157017811795371458
日期:2011.5.1
N-heterocyclic norbornene Dicarboximides were synthesized by reacting the exo-norbornene-5,6-dicarboxylic anhydride with 2-, 3-, and 4-aminopyridine. The amides resulting from 3 and 4-aminopyridine derivatives were converted into the corresponding betaines via Menshutkin reaction using ethyl-bromoacetate. The chemical structures of the obtained products were confirmed by FT-IR and 1H and 13C NMR spectroscopy, EA and MS as well as by calculation of 1H and 13C NMR chemical shifts using the GIAO method (PW91/6-311G++ (3df, 3pd) approximation by GAUSSIAN and PW91/IGLO-III approximation by deMon2k).
N-杂环降冰片烯二甲酰亚胺是通过外型降冰片烯-5,6-二甲酸酐与2-、3-和4-氨基吡啶反应合成的。由 3 和 4-氨基吡啶衍生物产生的酰胺通过使用溴乙酸乙酯的 Menshutkin 反应转化为相应的甜菜碱。通过 FT-IR 和 1H 和 13C NMR 光谱、EA 和 MS 以及通过使用 GIAO 方法计算 1H 和 13C NMR 化学位移(PW91/6-311G++ (3df, 3pd))确认了所得产物的化学结构GAUSSIAN 近似和 deMon2k 的 PW91/IGLO-III 近似)。