Highly Efficient Synthesis of 5-Substituted 1H-Tetrazoles Catalyzed by Cu-Zn Alloy Nanopowder, Conversion into 1,5- and 2,5-Disubstituted Tetrazoles, and Synthesis and NMR Studies of New Tetrazolium Ionic Liquids
作者:Gopalakrishnan Aridoss、Kenneth K. Laali
DOI:10.1002/ejoc.201100957
日期:2011.11
synthesize several novel tetrazolium ionic liquids (ILs) with EtSO4–, OTf–, and NTf2– counterions. Whereas alkylation of the 2,5-dialkyltetrazoles selectively gave the N-4 alkylated onium salts, with the 1,5-dialkyl derivatives approximately 1:1 mixtures of two tetrazolium salts were formed by alkylation at N-3 and N-4. The triflate and ethyl sulfate salts are room-temperature ILs that are hydrophilic, whereas
在Cu-Zn合金纳米粉体作为催化剂存在下,通过腈类RCN和NaN3之间的[3+2]环加成反应合成了一系列5-取代的1H-四唑。然后将 1,5-二丁基、1-丁基-5-己基、2,5-二丁基和 2-丁基-5-己基衍生物用作结构单元,用 EtSO4– 合成几种新型四唑鎓离子液体 (IL), OTf– 和 NTf2– 反离子。而 2,5-二烷基四唑的烷基化选择性地产生 N-4 烷基化鎓盐,而 1,5-二烷基衍生物通过在 N-3 和 N-4 处烷基化形成大约 1:1 的两种四唑盐混合物。三氟甲磺酸盐和乙基硫酸盐是亲水的室温离子液体,而 NTf2 盐是低熔点离子液体并且是疏水的。