Alkali metals dissolved in optically active solvents
作者:Keith D. Cooper、Harry M. Walborsky
DOI:10.1021/jo00323a026
日期:1981.5
Synthesis and p<i>K</i>
<sub>a</sub>
determination of new enantiopure dimethyl-substituted acridino-crown ethers containing a carboxyl group: Useful candidates for enantiomeric recognition studies
作者:Tamás Németh、Gergő Dargó、József Levente Petró、Zsófia Petrik、Sándor Lévai、Balázs Krámos、Zoltán Béni、József Nagy、György Tibor Balogh、Péter Huszthy、Tünde Tóth
DOI:10.1002/chir.22721
日期:2017.9
Newenantiopure dimethyl‐substituted acridino‐18‐crown‐6 and acridino‐21‐crown‐7 ethers containing a carboxyl group at position 9 of the acridine ring [(S,S)‐8, (S,S)‐9, (R,R)‐10] were synthesized. The pKa values of the newcrownethers [(S,S)‐8, (S,S)‐9, (R,R)‐10] and of an earlier reported macrocycle [(R,R)‐2] were determined by UV‐pH titrations. Crownether (S,S)‐8 was attached to silica gel by
在对cr啶环[[ S,S)-8,(S,S)-9,(R,R)-10 ]合成。新冠醚[(S,S)‐8,(S,S)‐9,(R,R)‐10 ]和较早报告的大环化合物[(R,R)‐2 ]的p K a值用UV-pH滴定法测定。冠醚(S,S)-8通过共价键连接到硅胶上,并通过高效液相色谱(HPLC)研究了新制备的手性固定相[(S,S)-CSP- 12 ]的对映体分离能力。观察到手性偏爱,对1-NEA的对映异构体实现了最佳分离。配体(S,S)-9和(R,R)-10是质子化伯胺,氨基酸及其衍生物的对映异构体的对映选择性传感器和选择分子的前体。
Synthesis of new enantiopure proton-ionizable crown ethers containing a dialkylhydrogenphosphate moiety
Seven new enantiopure proton-ionizable crown ethers containing a dialkylhydrogenphosphate moiety were prepared starting from optically active dialkyl-substituted oligoethylene glycols and phosphorus oxychloride followed by mild hydrolysis of the resulting macrocyclic chlorophosphates. Pentaethylene glycols having primary hydroxyl groups gave good yields of 17-crown-6 type ethers. Pentaethylene glycols