Reaction of 5-Aryloxytetrazoles with Dimethyl Sulfoxide and DMSO-Acetic Anhydride. Structure and Quantum-Chemical Calculations of 1-Methylsulfanylmethyl-5-(4-nitrophenoxy)tetrazole
作者:H. A. Dabbagh、N. Noroozi Pesyan、A. Bagheri、S. Takemo、H. Hayashi
DOI:10.1007/s11178-005-0293-9
日期:2005.7
Decomposition of methyl 5-(4-nitrophenoxy)tetrazole-2-carboxylate in dimethyl sulfoxide at room temperature yields a mixture of 1-methylsulfanylmethyl-5-(4-nitrophenoxy)tetrazole, 1- and 2-methyl-5-(4-nitrophenoxy)tetrazoles, and 5-(4-nitrophenoxy)tetrazole. Methyl 5-aryloxytetrazole-2-carboxylates containing electron-donor substituents in the aryloxy group do not give rise to the corresponding products under analogous conditions. The reactions of 5-aryloxytetrazoles [Ar = 4-O2NC6H4, C6H5, 2,6-(MeO)2C6H3] with dimethyl sulfoxide in the presence of acetic anhydride lead to mixtures of 1- and 2-methylsulfanylmethyl-5-aryloxytetrazoles whose yield and ratio depend on the substituent in the aryloxy group. The structure of 1-methylsulfanylmethyl-5-(4-nitrophenoxy)tetrazole was studied by X-ray analysis, two-dimensional NMR spectroscopy (HSQC, HMBC, NOESY), and quantum-chemical methods (ab initio, AM1, PM3). A highly selective procedure was developed for the synthesis of 5-(4-nitrophenoxy)tetrazole.
在室温下,甲基5-(4-硝基苯氧基)四唑-2-羧酸酯在二甲基亚砜中的分解反应生成1-甲硫基甲基-5-(4-硝基苯氧基)四唑、1-和2-甲基-5-(4-硝基苯氧基)四唑以及5-(4-硝基苯氧基)四唑的混合物。含有供电子取代基的芳氧基团的甲基5-芳氧基四唑-2-羧酸酯在类似条件下不会生成相应的产物。在乙酸酐存在下,5-芳氧基四唑[Ar = 4-O2NC6H4, C6H5, 2,6-(MeO)2C6H3]与二甲基亚砜的反应生成1-和2-甲硫基甲基-5-芳氧基四唑的混合物,其产率和比例取决于芳氧基团上的取代基。通过X射线分析、二维核磁共振光谱(HSQC, HMBC, NOESY)和量子化学方法(从头计算法,AM1, PM3)研究了1-甲硫基甲基-5-(4-硝基苯氧基)四唑的结构。开发了一种高度选择性的5-(4-硝基苯氧基)四唑合成方法。