One-pot microwave-assisted solvent-free synthesis, theoretical and experimental studies on barrier rotation of C–N bond of N-alkenyl-1,2,3-triazoles
作者:Maryam Malekdar、Avat Arman Taherpour、Issa Yavari、Kambiz Larijani
DOI:10.1007/s11224-014-0422-6
日期:2014.10
The reactions on benzotriazoles continue to happen to reach interesting varieties of their derivatives. This study reports a fast one-pot microwave-assisted solvent-free synthesis of N-alkenyl-1,2,3-benzotriazole (3, 5, and 7) and 1-(2-Alkyloxycarbonyl-vinyl)-1H-[1–3] triazole-4-carboxylic acid methyl ester (8 and 9) derivatives by nucleophilic addition reactions of 1,2,3-benzotriazole (C6H5N3) (1) and 1H-[1–3] triazole-4-carboxylic acid methyl ester (C4H4N3O2) (1′) with R-propiolates (R = Me, Et; 2 & 4) and phenylacetylene 6 in good yields. The values of activation energy for rotation around C–N bond in the synthesized N-alkenyl-1,2,3-triazole compounds were studied by DFT-B3LYP/6-31G* method.
苯并三唑的反应不断发生,产生了有趣的衍生物。本研究报告了一种快速一锅法微波辅助无溶剂合成 N-烯基-1,2,3-苯并三唑(3、5 和 7)和 1-(2-烷氧基羰基-乙烯基)-1H-[1 –3] 三唑-4-甲酸甲酯(8 和 9) 通过 1,2,3-苯并三唑 (C6H5N3) (1) 和 1H-[1–3] 三唑-4-甲酸甲酯的亲核加成反应生成衍生物酯 (C4H4N3O2) (1′) 与 R-丙炔酸酯 (R = Me, Et; 2 & 4) 和苯乙炔 6 的产率良好。采用DFT-B3LYP/6-31G*方法研究了合成的N-烯基-1,2,3-三唑化合物绕C-N键旋转的活化能值。