作者:José A. Manso、Isaac F. Céspedes Camacho、Emilio Calle、Julio Casado
DOI:10.1039/c1ob05298e
日期:——
reactions of the nucleoside guanosine (Guo) by the α,β-unsaturated compounds (α,β-UC) acrylonitrile (AN), acrylamide (AM), acrylic acid (AA) and acrolein (AC), which can act as alkylating agents of DNA, were investigated kinetically. The following conclusions were drawn: i) The Guo alkylation mechanism by AC is different from those brought about the other α,β-UC; ii) for the first three, the following sequence
α,β-不饱和化合物(α,β-UC)对核苷鸟苷(Guo)的烷基化反应 丙烯腈 (一个), 丙烯酰胺 (是), 丙烯酸 (AA)和 丙烯醛(AC),可以充当DNA的烷基化剂,进行了动力学研究。得出以下结论:i)AC引发的郭氏烷基化机理与其他α,β-UC产生的机理不同;ii)对于前三个,发现以下烷基化电位序列:AN> AM> AA;iii)发现AN,AM和AA的化学反应性(烷基化速率常数)与它们与生物标志物形成加合物的能力之间存在相关性。iv)AN和AM的Guo烷基化反应是通过Michael加成机理发生的,在第一种情况下是可逆的,在第二种情况下是不可逆的。Guo-AN加合物形成的平衡常数为K eq(37°C)= 5×10 -4。v)低能垒(≈10kJ mol -1)通过AN逆转Guo烷基化反应反映了该反应的容易逆转性,并可能通过修复机理进行了纠正;vi)在pH <8.0下未观察到AN,AM和A