Low-temperature photooxygenation of coelenterate luciferin analog synthesis and proof of 1,2-dioxetanone as luminescence intermediate
作者:Ken Usami、Minoru Isobe
DOI:10.1016/0040-4020(96)00699-0
日期:1996.9
13C-enriched coelenterate luciferin analogs were photooxygenated at −78°C to form two peroxidic products as luminescent intermediates. Structures of these unstable intermediates were deduced by means of 13C NMR spectra at low temperatures using substrates enriched at three sites by 13C. Photooxygenation in a mixture of CF3CD2OD and CD3OD as highly protic solvents afforded the dioxetanone and 2-hydroperoxide. These
在2-位具有叔丁基的腔肠荧光素类似物适合在各种条件下进行化学发光研究。在低温(-78°C)下对类似物进行光氧化可得到发光中间体,该发光中间体通过用PPh 3还原而被证明是过氧化物,从而导致发光能力下降。为了通过13 C NMR阐明这些积累的发光中间体的结构,在3,7-二氢咪唑并[1,2-a]吡嗪-3-酮的2、3和5位合成了三个13 C富集的类似物。骨架具有99%的富集和位点特异性。这13个将富C的腔肠荧光素类似物在-78°C进行光氧化,以形成两种过氧化物产物,作为发光中间体。这些不稳定的中间体的结构用的手段推断13 C NMR光谱在使用在三个位点被富集的底物低的温度13 ℃。在光氧化CF的混合物3 CD 2 OD和CD 3 OD为高度的质子溶剂,得到dioxetanone和2 -氢过氧化物。在含有酸或碱的二甘醇二甲醚(DGM)中稀释到10 -5 M后,这两种过氧化物在不同的温度下分别在400