Synthesis of Chiral Crown Ethers Having Bromoarylene Moieties on Their Rim. Anomalous Behavior of Racemic Substrates in Cyclization to Crown Ethers
作者:Syun-ichi Kiyooka、Mitsuhiro Tada、Sachie Kan、Mizue Fujio
DOI:10.1246/bcsj.69.2595
日期:1996.9
acyclic diol, bridged by two (R)-binaphthyl moieties, underwent cyclization reaction with diethylene glycol ditosylate to afford the corresponding (R,R)-bis(binaphtho)-22-crown-5 in a good yield (69%). A one-pot cyclization reaction of (R)-2,2′-dihydroxy-1,1′-binaphthyl with 2,6-bis(bromomethyl)bromobenzene resulted in a good yield (45%) of (R,R)-bis(binaphtho)-22-crown-4, having two symmetrical bromoarylene
Bis(binaphtho)-22-crown-5 和 bis(binaphtho)-22-crown-4,在其边缘具有溴亚芳基部分,由 (R)-和 (S)-2,2'-dihydroxy-1 制备, 1'-联萘。由两个 (R)-联萘基部分桥接的无环二醇与二甲苯磺酸二甘醇酯进行环化反应,以良好的产率 (69%) 得到相应的 (R,R)-双(联萘)-22-冠-5。(R)-2,2'-二羟基-1,1'-联萘与 2,6-双(溴甲基)溴苯的一锅环化反应导致 (R,R)-的良好产率 (45%) bis(binaphtho)-22-crown-4,具有两个对称的溴亚芳基单元。与以 (R)- 和 (S)-2,2' -dihydroxy-1,1'-binaphthyl 开始的情况相比,环化反应中的外消旋体没有得到预期比例的相应冠产物。