5-Methyl-7-aryl-4,7-dihydrotetrazolo[1,5-a]pyrimidine-6-carboxylic esterderivatives were efficiently synthesized by reaction of methyl or ethyl acetoacetate, 5-aminotetrazole (produced from 2-cyanoguanidine and sodium azide), and various aromatic aldehydes in presence of a new cellulose-based Ag-loaded magnetic bionanostructure. This protocol offers many advantages such as short reaction time, high
通过乙酰乙酸甲酯或乙酸乙酯,5-氨基四唑(由2-氰基胍和叠氮化钠制得)有效合成5-甲基-7-芳基-4,7-二氢四唑[1,5- a ]嘧啶-6-羧酸酯衍生物)和各种芳族醛,并存在新的基于纤维素的银负载磁性生物纳米结构。该方案具有许多优点,例如反应时间短,收率高,纳米复合材料具有显着的磁性,并且易于从反应混合物中分离出纳米催化剂,而不会显着降低催化活性。此外,X射线衍射分析,场发射扫描电子显微镜和能量色散X射线(EDX)分析被用来表征制备的纳米催化剂。
Solvent-free synthesis of 5-methyl-7-aryl-4,7-dihydrotetrazolo[1,5-<i>a</i>]pyrimidine-6-carboxylic esters catalyzed by sulfamic acid
作者:Changsheng Yao、Song Lei、Cuihua Wang、Chenxia Yu、Shujiang Tu
DOI:10.1002/jhet.5570450609
日期:2008.11
The solvent-freesynthesis of 5-methyl-7-aryl-4,7-dihydrotetrazolo[1,5-a]pyrimidine-6-carboxylicesters was performed and effectively catalyzed by sulfamicacid. Compared with conventional methods, this protocol features mild reaction conditions and high yields. Furthermore, it is solvent-free and thus eco-friendly.
进行了无溶剂的5-甲基-7-芳基-4,7-二氢四唑并[1,5 - a ]嘧啶-6-羧酸酯的合成,并被氨基磺酸有效地催化。与常规方法相比,该方案具有温和的反应条件和高收率。此外,它不含溶剂,因此对环境无害。