Magnesium methoxide-induced chemiluminescent decomposition of bicyclic dioxetanes bearing a 2′-alkoxy-2-hydroxy-1,1′-binaphthyl-7-yl moiety
作者:Hidehisa Kawashima、Nobuko Watanabe、Hisako K. Ijuin、Masakatsu Matsumoto
DOI:10.1002/bio.2419
日期:2013.9
Bicyclic dioxetanes 2a–c bearing a 2′-alkoxy-2-hydroxy-1,1′-binaphthyl-7-yl moiety were effectively synthesized and their base-induced chemiluminescent decomposition was investigated by the use of alkaline metal (Na+ and K+) or Mg2+ alkoxide in MeOH. When 2a–c were treated with tetrabutylammonium fluoride (TBAF) in dimethyl sulfoxide (DMSO) as a reference system, they showed chemiluminescence as a flash of orange light (maximum wavelength λmaxCL = 573–577 nm) with efficiency ΦCL = 6–8 × 10–2. On the other hand, for an alkaline metal (Na+ or K+) alkoxide/MeOH system, 2a–c decomposed slowly to emit a glow of chemiluminescence, the spectra of which were shifted slightly toward red from the TBAF/DMSO system, and ΦCL (= 1.4–2.3 × 10–3) was considerably decreased. In addition, Mg(OMe)2 was found to play a characteristic role as a base for the chemiluminescent decomposition of 2a–c through coordination to the intermediary oxidoaryl-substituted dioxetanes 13. Thus, Mg2+ increased ΦCL to more than twice those with Na+ or K+, while it shifted λmaxCL considerably toward blue (λmaxCL = 550–566 nm). Copyright © 2012 John Wiley & Sons, Ltd.
我们有效地合成了含有 2′-烷氧基-2-羟基-1,1′-联萘-7-基分子的双环二氧杂环丁烷 2a-c,并通过在 MeOH 中使用碱金属(Na+ 和 K+)或 Mg2+氧化碱研究了它们在碱诱导下的化学发光分解。用二甲基亚砜(DMSO)中的四丁基氟化铵(TBAF)作为参比体系处理 2a-c 时,它们的化学发光表现为橙色闪光(最大波长 λmaxCL = 573-577 nm),效率为 ΦCL = 6-8 × 10-2。另一方面,在碱金属(Na+ 或 K+)氧化烷/MeOH 体系中,2a-c 缓慢分解,发出化学发光,其光谱与 TBAF/DMSO 体系相比略微偏向红色,ΦCL(= 1.4-2.3 × 10-3)显著降低。此外,还发现 Mg(OMe)2 通过与中间体草酰基取代的二氧杂环丁烷 13 配位,在 2a-c 的化学发光分解过程中发挥了特有的碱作用。因此,Mg2+ 可使 ΦCL 增加到 Na+ 或 K+ 的两倍以上,同时使 λmaxCL 显著向蓝色移动(λmaxCL = 550-566 nm)。Copyright © 2012 John Wiley & Sons, Ltd. All Rights Reserved.