Base-induced chemiluminescence of 5- tert -butyl-1-(4-hydroxybenz[ d ]oxazol-6-yl)-4,4-dimethyl-2,6,7-trioxabicyclo[3.2.0]heptanes: chemiluminescence–chemiexcitation profile in aqueous medium
摘要:
Bicyclic dioxetanes bearing a 2-aryl-4-hydroxybenz[d]oxazol-6-yl moiety (3a-3c) and their 2-alkyl-analogs (3d, 3e) were synthesized. All these dioxetanes (3a-3e) afforded light with high efficiency on treatment with tetrabutylammonium fluoride in acetonitrile. In the NaOH-H2O system, chemiluminescence efficiency (Phi (CIEEL)) for alkyl-analogs (3d, 3e) decreased markedly, while Phi (CIEEL) for 3a-3c was still considerably high. Fluorescence study revealed that the marked decrease of (Phi (CIEEL)) for alkyl-analogs would be attributed to a synergetic effect of decreased chemiexcitation yield and fluorescence yield of the emitter in NaOH-H2O system. (C) 2001 Elsevier Science Ltd. All rights reserved.
This work describes novel in vitro inhibitors of human mitochondrial (mdN) and cytosolic (cdN) 5′(3′)-deoxynucleotidases. We designed a series of derivatives of the lead compound (S)-1-[2-deoxy-3,5-O-(phosphonobenzylidene)-β-D-threo-pentofuranosyl]thymine bearing various substituents in the para position of the benzylidene moiety. Detailed kinetic study revealed that certain para substituents increase
这项工作描述了人类线粒体(mdN)和胞质(cdN)5'(3')-脱氧核苷酸酶的新型体外抑制剂。我们设计了一系列铅化合物(S)-1- [2-脱氧-3,5 - O-(膦酰苄叉基)-β- D-苏-戊呋喃糖基]胸腺嘧啶的衍生物,这些胸腺嘧啶在苄叉基的对位带有多个取代基部分。详细的动力学研究表明,某些对位取代基提高了抑制能力(碘衍生物;K mdN i = 2.71μM),而某些取代基诱导了对cdN的选择性转移(羧基衍生物,K cdN i= 11.60μM; 碘氧基衍生物,K cdN i = 6.60μM)。与这些化合物中的三种复合的mdN晶体结构表明,各种对位取代基在酶活性位点内导致两种替代的抑制剂结合方式。还通过异核NMR光谱法鉴定了cdN络合物的两种结合模式。
The Spectral Properties of Alkoxymethyl Cations<sup>1</sup>
作者:B. G. Ramsey、R. W. Taft
DOI:10.1021/ja00965a030
日期:1966.7
Synthesis of Amphiphilic Thiatrimethinecyanines
作者:N. A. Orlova、E. F. Kolchina、M. M. Shakirov、T. N. Gerasimova、V. V. Shelkovnikov
DOI:10.1023/b:rujo.0000034946.67023.70
日期:2004.2
Preparation conditions were optimized for 2-methyl-5-chlorobenzothiazolium quaternary salts with long-chain N-alkyl substituents (C12H25, C15H31, C18H37) They were used in the synthesis of thiatrimethinecyanines conteining in the meso-position phenyl, p-chlorophenyl, or p-fluorophenyl groups.
Bennett,G.B. et al., Journal of Heterocyclic Chemistry, 1979, vol. 16, p. 1389 - 1392
作者:Bennett,G.B. et al.
DOI:——
日期:——
Substituted methyl groups
作者:W.A. Sheppard
DOI:10.1016/s0040-4020(01)92493-7
日期:1971.1
The substituent parameters for the series of mono-, di- and trisubstituted Me groups, CH2X, CHX2, and CX3 where X is F, Cl, Br, OMe, SCF3 and CN, have been determined from F19 NMR measurements on the corresponding meta- and para-fluorotoluenes. An additive linear effect of substitution is found only for the cyano substituent. A saturation effect noted for the groups where X is F, Cl, Br and SCF3 (particularly