Photosensitized Oxidation of <sup>13</sup>C,<sup>15</sup>N-Labeled Imidazole Derivatives
作者:Ping Kang、Christopher S. Foote
DOI:10.1021/ja012253d
日期:2002.8.1
rearranges to a carbamate 9 by opening and reclosing the five-membered ring. 9 decomposes to CO(2) and benzil diimine. A labile NH in the imidazole is crucial for the decomposition of the initially formed endoperoxide, otherwise the endoperoxidedecomposes to regenerate starting material. Many similarities exist between the photooxidations of imidazole and guanosine in organic solvent, suggesting that the two
A new synthesis of the linearly fused [1,2,4]triazolo[1,5-b]isoquinoline ring. Observation of an unexpected Dimroth rearrangement
作者:László Filák、Zsuzsanna Riedl、Orsolya Egyed、Mátyás Czugler、Cuong N. Hoang、Joachim G. Schantl、György Hajós
DOI:10.1016/j.tet.2007.10.103
日期:2008.2
derivatives) a Dimrothrearrangement took place under the same reaction conditions to yield 3-isoquinolylhydrazones. The mechanism of this unexpected transformation has been verified by isotope labelling experiments. Clarification of the reaction mechanism allowed finding proper reaction conditions to eliminate the rearrangement route, and thus, to perfect successful ring closure to the fused triazoles
从2,3-二氨基异喹啉鎓盐开始,已经阐明了线性稠合的[1,2,4]三唑并[1,5- b ]异喹啉环系统的新的和一般的合成。在4位带有烷基的起始化合物容易与醛反应生成环化产物。在4位上缺乏给电子基团的情况下(例如,未取代的或4-氰基取代的二氨基衍生物),在相同的反应条件下进行了狄莫罗斯重排,从而产生了3-异喹啉基hydr。同位素标记实验已验证了这种意外转变的机理。澄清反应机理使得可以找到合适的反应条件以消除重排路线,从而完美地完成对稠合三唑的成功闭环。
Hoshino, Jun-ichi; Yamamoto, Yukio; Hasegawa, Takeshi, Bioscience, Biotechnology and Biochemistry, 1994, vol. 58, # 11, p. 1939 - 1941
Synthesis of a 13C,15N labeled imidazole and characterization of the 2,5-endoperoxide and its decomposition
作者:Ping Kang、Christopher S Foote
DOI:10.1016/s0040-4039(00)01731-7
日期:2000.12
A synthesis of C-13, N-15 labeled imidazoles was developed which allows the direct detection of a transient 2,5-endoperoxide at -100 degreesC. The endoperoxide was thoroughly characterized by H-1,C-13 and N-15 NMR. Upon warming, the endoperoxide decomposes via a series of transient intermediates to (CO2)-C-13 and 1,2-diphenyl-ethanediimine. (C) 2000 Elsevier Science Ltd. All rights reserved.
Structure of trimethylsilyl amides
作者:Claude H. Yoder、William C. Copenhafer、Brent DuBeshter