Synthesis and structural and photoswitchable properties of novel chiral host molecules:: Axis chiral 2,2′-dihydroxy-1,1′-binaphthyl-appended stiff-stilbene

被引:51
|
作者
Shimasaki, Toshiaki
Kato, Shin-ichiro
Ideta, Keiko
Goto, Kenta
Shinmyozu, Teruo
机构
[1] Kyushu Univ, IMCE, Higashi Ku, Fukuoka 8128581, Japan
[2] Kyushu Univ, Grad Sch Sci, Dept Mol Chem, Higashi Ku, Fukuoka 8128581, Japan
[3] IMCE, Kasuga, Fukuoka 8168580, Japan
来源
JOURNAL OF ORGANIC CHEMISTRY | 2007年 / 72卷 / 04期
关键词
D O I
10.1021/jo061127v
中图分类号
O62 [有机化学];
学科分类号
070303 ; 081704 ;
摘要
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 images in the CD spectra, where two split Cotton effects (exciton coupling) were observed in the beta-transitions of the naphthyl chromophore at 222 and 235 nm, but no Cotton effect was observed in the stiff-stilbene chromophore at 365 nm. The structures of (R)-10 and trans-(R,R)-1 were confirmed by X-ray structural analysis. The optimized structure of cis-1 by MO calculations has a wide chiral cavity of 7-8 A in diameter, whereas trans-1 cannot form an intramolecular cavity based on the X-ray data. Irradiation of (R,R)-trans-1 with black light (lambda = 365 nm) in CH3CN or benzene at 23 degrees C led to the conversion to the corresponding cis-isomer, as was monitored by H-1 NMR, UV-vis, and CD spectra. At the photostationary state, the cis-1/trans-1 ratio was 86/14 in benzene or 75/25 in CH3CN. On the other hand, irradiation of the cis-1/trans-1 (75/25) mixture in CH3CN with an ultra-high-pressure Hg lamp at 23 degrees C (lambda = 410 nm) led to the photostationary state, where the cis-1/trans-1 ratio was estimated to be 9/91 on the basis of the H-1 NMR spectra. The cis-trans and trans-cis interconversions could be repeated 10 times without decomposition of the CC double bond. Thus, a new type of photoswitchable molecule has been developed, and trans-1 and cis-1 were quite durable under irradiation conditions. The guest binding properties of the BINOL moieties of trans- and cis-(R,R)-1 with F-, Cl-, and H2PO4- were examined by H-1 NMR titration in CDCl3. Similar interaction with F- and Cl- was observed in trans-1 (host/guest = 1/1, K-assoc = (1.0 +/- 0.13) x 10(3) for F- and (4.6 +/- 0.72) x 10(2) M-1 for Cl-) and cis-1 (host/guest = 1/1, K-assoc = (1.0 +/- 0.13) x 10(3) for F- and (5.9 +/- 0.69) x 10 M-1 for Cl-), but H2PO4- interacted differently: the cis-isomer formed the 1/1 complex (K-assoc = (9.38 +/- 2.67) x 10 M-1), whereas multistep equilibrium was expected for the trans-isomer.
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收藏
页码:1073 / 1087
页数:15
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