作者:Ren-Hong Chen、Jin-Feng Xiong、Pai Peng、Guang-Zhen Mo、Xing-San Tang、Zhao-Yang Wang、Xiu-Fang Wang
DOI:10.14233/ajchem.2014.16438
日期:——
By using low cost and readily available amino acids as the synthetic blocks, a series of 2-aminomethyl-benzimidazole are synthesized with solvent-free melting method. While the condensation of aspartic acid (or asparagine) with o-diaminobenzene gives the fluorescent bisbenzimidazole product without amino group via the further deamination reaction in the melting reaction system. The condensation reactions between most amino acids and o-diaminobenzenes exhibits higher yields of 58 to 86 % (mostly over 66 %), shorter reaction time (5 h) than that previously reported and better tolerance for different functional groups in amino acids. The structures of twenty benzimidazoles with multifunctional groups, including thirteen new compounds, are systematically characterized with FTIR, 1H NMR, 13C NMR, MS and elemental analysis. These investigations are beneficial to the further researches on their applications in biochemistry, coordination chemistry and organic synthesis intermediates.
利用低成本且易获取的氨基酸作为合成模块,通过无溶剂熔融法合成了一系列2-氨基甲基苯并咪唑。将天冬氨酸(或天冬酰胺)与邻二氨基苯缩合,在熔融反应体系中通过进一步的脱氨基反应得到了无氨基的发光双苯并咪唑产物。大多数氨基酸与邻二氨基苯的缩合反应表现出更高的产率(58%至86%,大多超过66%),反应时间更短(5小时),并且对氨基酸中的不同官能团具有更好的耐受性。通过FTIR、1H NMR、13C NMR、MS和元素分析系统地表征了含有多官能团的二十种苯并咪唑的结构,其中包括十三种新化合物。这些研究有利于进一步探索它们在生物化学、配位化学和有机合成中间体中的应用。