New view of acylase promiscuity: An extended study on the acylase-catalyzed Markovnikov addition
作者:Bo-Kai Liu、Qi Wu、De-Shui Lv、Xin-Zhi Chen、Xian-Fu Lin
DOI:10.1016/j.molcatb.2011.08.002
日期:2011.12
to be able to catalyze Markovnikov addition of N-heterocycles to vinyl esters recently. Some interesting and unexplainable observations drew our attention, and the acylase-catalyzed Markovnikov addition was investigated further in this paper. We detected an acylation product in the reaction and found that acetaldehyde was able to improve the reaction rate. Moreover, Markovnikov adduct could be formed
酰基转移酶已经显示出对非天然底物的多种混杂。例如,已经证明酰化酶能够催化N的马尔可夫尼可夫加成。杂环最近成为乙烯基酯。一些有趣且无法解释的发现引起了我们的注意,并且本文进一步研究了酰基转移酶催化的马尔可夫尼可夫加成反应。我们在反应中检测到酰化产物,发现乙醛能够提高反应速率。而且,可以在乙醛存在下,使用乙酸异丙烯酯或2,2,2-三氟乙酸乙酯作为底物,形成马尔可夫尼科夫加合物。基于这些结果,提出了所谓的酰基转移酶催化的马尔可夫尼可夫加成实际上由三个步骤组成,所述三个步骤被确定为酰化,半胱氨酸中间体形成和酯交换。该发现表明,添加马尔可夫尼科夫的酰基转移酶是伪混杂的。