作者:Hiroki Kondo、Katsuhito Miura、Eiji Seki、Junzo Sunamoto
DOI:10.1246/bcsj.58.2801
日期:1985.10
mechanism of biotin-dependent carboxylation reactions, the following model experiments have been carried out. In reactions of carbonate derivatives such as methyl chloroformate with 2-ethoxy-2-imidazoline (1), a putative enolic biotin model, or 2-imidazolidinone (2), the former showed a much higher reactivity to provide the methoxycarbonylated 1 (3). Reactions of 3 with benzenethiolate, cyclohexylamine
为了描述生物素依赖性羧化反应的机制,进行了以下模型实验。在碳酸酯衍生物(如氯甲酸甲酯)与 2-乙氧基-2-咪唑啉(1)、推定的烯醇生物素模型或 2-咪唑啉酮(2)的反应中,前者显示出更高的反应性以提供甲氧基羰基化的 1(3) . 3 与苯硫醇、环己胺和碳负离子的反应也已被研究作为从 N-羧基生物素到受体底物的羧基转移模型。只有碳负离子攻击 3 的羰基碳,导致 C-O 键断裂,而不是 N-C 键断裂。用 1-甲氧基羰基咪唑 (9) 作为供体底物进行净“羧基”转移。讨论了这些结果对生物素催化的影响。