Abstract A new easy‐to‐run route to cyclen, homocyclen, and cyclam is proposed, based on the cyclization with dibromo‐ or ditosyloxy‐derivatives of bisaminal intermediates obtained by condensation of the appropriate linear tetraamine with cyclohexanedione. In the cyclization step, the use of cesium carbonate instead of potassium carbonate as proton trapper caused a remarkable increase of yields.
摘要 基于将合适的线性四胺与环己二酮缩合得到的双胺中间体的二
溴或二
甲苯磺酰氧基衍
生物进行环化反应,提出了一种新的易于运行的循环途径,即环己二酮、高环烯和环己二酮。在环化步骤中,使用
碳酸铯代替
碳酸钾作为质子捕集剂,显着提高了产率。