Efficient synthesis of a hetero[4]rotaxane by a “threading-stoppering-followed-by-clipping” approach
作者:Jun Yin、Chunyan Chi、Jishan Wu
DOI:10.1039/c001343a
日期:——
the synthesis of a hetero[4]rotaxane, in which one cucurbit[6]uril (CB[6]) and two hetero crown ether macrocycles are threaded onto one dumbbell-shaped molecule. The process involves three steps: (1) threading of a CB[6] macrocycle onto a thread containing two dialkylammonium sites to form a CB[6]-based pseudo[2]rotaxane; (2) stoppering of the as-formed pseudo[2]rotaxane by imine condensation reaction
“杂物切断”技术被用于杂[4]轮烷的合成,其中一种 葫芦[6]尿 (CB [6])和两个杂冠醚大环被旋接到一个哑铃形分子上。该过程涉及三个步骤:(1)将CB [6]大环穿线到包含两个二烷基铵位点的线程上以形成基于CB [6]的线程假[2]轮烷; (2)封堵的形式假[2]轮烷通过亚胺缩合反应,然后还原/质子化得到具有两个新的二烷基铵位点的基于CB [6]的[2]轮烷。(3)将两个杂冠醚大环选择性剪切到新形成的铵盐 位和随后还原每个冠醚中的亚胺键以提供最终 杂[4]轮烷产量高。整个过程通过NMR光谱法进行,并且通过NMR光谱法,元素分析和质谱法确认了杂[4]轮烷的结构。