Synthesis and Structural and Photoswitchable Properties of Novel Chiral Host Molecules: Axis Chiral 2,2‘-Dihydroxy-1,1‘-binaphthyl-Appended <i>stiff</i>-Stilbene<sup>1</sup>
作者:Toshiaki Shimasaki、Shin-ichiro Kato、Keiko Ideta、Kenta Goto、Teruo Shinmyozu
DOI:10.1021/jo061127v
日期:2007.2.1
Novel photoswitchable chiral hosts having an axis chiral 2,2‘-dihydroxy-1,1‘-binaphthyl (BINOL)-appended stiff-stilbene, trans-(R,R)- and -(S,S)-1, were synthesized by palladium-catalyzed Suzuki−Miyaura coupling and low-valence titanium-catalyzed McMurry coupling as key steps, and they were fully characterized by various NMR spectral techniques. The enantiomers of trans-1 showed almost complete mirror
具有手性轴的2,2'-二羟基-1,1'-联萘(BINOL)新型光可手性主机-appended僵硬芪,反式- (- [R ,- [R )-和- (小号,小号) - 1,合成通过钯催化的Suzuki-Miyaura偶联和低价钛催化的McMurry偶联作为关键步骤,并且通过各种NMR光谱技术对其进行了充分表征。的对映异构体的反式- 1显示该CD光谱,其中在222和235处的萘基的发色团的β转变观察到两个分裂棉效果(激子耦合)几乎完全镜像,但在没有观察到Cotton效应在365 nm处具有刚性的-1,2-苯乙烯lb生色团。通过X射线结构分析证实了(R)-10和反式-(R,R)-1的结构。通过MO计算得出的cis - 1的最佳结构具有直径为7-8Å的宽手征腔,而trans - 1无法基于X射线数据形成分子内腔。在23°C下用CH 3 CN或苯中的黑光(λ= 365 nm)辐照(R,R)-trans -