Synthesis, Characterization, and Computational Modeling of N-(1-Ethoxyvinyl)pyridinium Triflates, an Unusual Class of Pyridinium Salts
作者:Jonathan Shapiro、Justin Sonberg、Benjamin Schafer、Christopher Williams、Hannah Ferris、Eric Reinheimer、Adam Van Wynsberghe、Charles Kriley、Max Majireck
DOI:10.3390/molecules23020413
日期:——
N-Substituted pyridinium salts constitute one of the most valuable reagent classes in organic synthesis, due to their versatility and ease of use. Herein we report a preliminary synthesis and detailed structural analysis of several N-(1-ethoxyvinyl)pyridinium triflates, an unusual class of pyridinium salts with potentially broad use as a reagent in organic synthesis. Treatment of pyridines with trifluoromethane
N-取代的吡啶盐由于其多功能性和易用性而构成有机合成中最有价值的试剂类别之一。在此,我们报告了几种 N-(1-乙氧基乙烯基) 吡啶鎓三氟甲磺酸盐的初步合成和详细结构分析,这是一种不寻常的吡啶鎓盐类,在有机合成中可能广泛用作试剂。用三氟甲磺酸和乙氧基乙炔处理吡啶会产生稳定、可分离的加合物,由于其新颖性,这些加合物已被广泛表征。三维结构稳定性由一系列 C–H•••O 氢键维持,这些氢键涉及来自三氟甲磺酸盐阴离子的 –SO3 基团的氧原子,以及来自吡啶鎓阳离子的芳环和乙烯基的氢原子。密度泛函理论计算关于 2-chloro-1-(1-ethoxyvinyl)pyridine-1-ium trifluoromethanesulfonate (7) 和 1-(1-ethoxyvinyl)pyridine-的环外 C-N 键旋转的能量景观的预测-还报道了三氟甲磺酸 1 鎓 (16)。值得注意的是,预测的全局能量最小值为