Chiral Recognition between a Substituted Cyclooctatetraene Dianion and a Half Crown Ether Substituted with Ibuprofen
作者:Cheryl D. Stevenson、Daniel K. Cashion
DOI:10.1021/jo000972p
日期:2000.11.1
(S)-Verbenol was substituted onto cyclooctatetraene (COT) via an ether linkage. In tetrahydrofuran (THF), Cs(+) or Na(+) counterions are tightly ion associated with the verbenoxy-COT dianion. A cosolvent, consisting of an ibuprofen unit connected to a half crown ether, was added to the verbenoxy-COT(2)(-),M(+)(2) solutions. The intimate interaction between the chiral cosolvent (ibuprofoxymethoxyethoxyethane)
通过醚键将(S)-马鞭草酚取代到环辛酸酯(COT)上。在四氢呋喃(THF)中,Cs(+)或Na(+)抗衡离子与苯甲氧基-COT二价阴离子紧密缔合。将由连接到半冠醚的布洛芬单元组成的助溶剂加入到verbenoxy-COT(2)(-),M(+)(2)溶液中。手性助溶剂(异丁苯丙氧基甲氧基乙氧基乙烷)和离子缔合的抗衡离子(Na(+)或Cs(+))之间的亲密相互作用迫使马鞭草氧基部分和异丁苯丙氧基部分之间发生手性识别。当二价四氢呋喃溶液中存在摩尔过量的助溶剂时,与苯甲氧基-COT(2)(-),M(+)(2)配合物缔合的助溶剂与未配合的助溶剂的分离允许对映体的部分拆分异丁氧基甲氧基乙氧基乙烷。