Synthesis of ubiquinones-3 specifically labelled with 13C at C(5)- or C(6)- positions
作者:Claude Boullais、Jacques Breton、Eliane Nabedryk、Charles Mioskowski
DOI:10.1016/s0040-4020(96)01181-7
日期:1997.2
equimolecular mixture of (3-13C) 3-bromo-2-chloro-5-methylbenzoquinone (6a) and (2-13C) 2-bromo-3-chloro-5-methylbenzoquinone (7a) which was easily separated by HPLC under the hydroquinone form. The labelled positions were assigned on the basis of 1H-NMR and the two intermediates were separately elaborated to the corresponding (5-13C) and (6-13C) ubiquinones-3.
(5- 13 C)和(6- 13 C)泛醌-3(20A和20B)由(1-合成13 C)三氯乙酸(图8a)中的12个步骤。的关键步骤是狄尔斯-阿尔德2,5-双(三甲基甲硅烷基)-3-甲基呋喃(间反应2)和(2- 13 C)2-溴-1,1-二氯乙烯(4A),得到的等摩尔混合物( 3- 13 C)3-溴-2-氯-5-甲基苯醌(6a)和(2- 13 C)2-溴-3-氯-5-甲基苯醌(7a),其很容易通过HPLC以对苯二酚形式分离。将标记的位置被指定的基础上1 H-NMR和两个中间体分别阐述为相应的(5- 13 C)和(6- 13 C)泛醌-3。