Synthesis, X-ray and conformational studies of novel tetrazole-containing macrocycles: 4,13-dioxa-1,7,8,9,17,18,19,20-octaazatricyclo[14.2.1.17,10]icosa-8,10(20),16(19),17-tetraene and 4,14-dioxa-1,7,8,9,10,18,19,20-octaazatricyclo[15.2.1.07,10]icosa-8,10,17(20),18-tetraene†
作者:Vadim Yu. Zubarev、Rostislav E. Trifonov、Vyacheslav V. Filichev、Vladimir A. Ostrovskii、Andrew D. Abell、Michael K. Edmonds
DOI:10.1039/b006217k
日期:——
Alkylation of 1,5-bis(tetrazol-5-yl)-3-oxapentane by 2,2′-dichlorodiethyl ether under conditions of high dilution led to two isomeric crown-like macrocycles: 4,13-dioxa-1,7,8,9,17,18,19,20-octaazatricyclo[14.2.1.17,10]icosa-8,10(20),16(19),17-tetraene 2 and 4,14-dioxa-1,7,8,9,10,18,19,20-octaazatricyclo[15.2.1.07,10]icosa-8,10,17(20),18-tetraene 3. The crystal structures of both compounds were determined. In the crystalline state, macrocycle 2 exists in syn-form with a symmetry near Cs, whereas macrocycle 3 has only C1 symmetry. The latter was observed to adopt two different conformations in the crystalline state. An AM1 conformational analysis of macrocycle 2 revealed 30 different conformations, one of which is similar to the observed crystal structure.
在高稀释条件下,2,2′-二氯二乙醚对 1,5-双(四唑-5-基)-3-氧杂戊烷进行烷基化反应,产生了两种异构的冠状大环:4,13-dioxa-1,7,8,9,17,18,19,20-octaazatricyclo[14.2.1.17,10]icosa-8,10(20),16(19),17-tetraene 2 and 4,14-dioxa-1,7,8,9,10,18,19,20-octaazatricyclo[15.2.1.07,10]icosa-8,10,17(20),18-tetraene 3.这两种化合物的晶体结构均已确定。在晶体状态下,大环 2 以对称性接近 Cs 的合成形式存在,而大环 3 则只有 C1 对称性。据观察,后者在结晶状态下有两种不同的构象。对大环 2 的 AM1 构象分析发现了 30 种不同的构象,其中一种与观察到的晶体结构相似。