Investigating the effect of hydrogen bonding environments in amide cleavage reactions at zinc(ii) complexes with intramolecular amide oxygen co-ordination
作者:Juan C. Mareque Rivas、Emiliano Salvagni、Simon Parsons
DOI:10.1039/b414223c
日期:——
ligands without hydrogenbonding groups (1,10-phenanthroline L5, 2-(aminomethyl)pyridine L6) as control compounds, and with an amino hydrogenbonding group (6-amino-2-(aminomethyl)pyridine L7) have been synthesised. Amide cleavage is in this case faster at the zinc(II) complex with the amino hydrogenbonding group. Thus, hydrogenbonding environments can both accelerate and slow down amide bond cleavage reactions
酰胺键与氢键合微环境周围的锌(II)离子配位是金属蛋白酶的常见结构/功能特征。我们报告了两种策略将氢键基团定位在锌(II)结合的酰胺氧附近,并且我们研究了它们对酰胺基团稳定性的影响。多齿三脚架配体(6-R1-2-吡啶甲基)-R2(R1 = NHCOtBu,R2 = N(CH2-py-6-X)2 X = H L1,X = NH2,H L2,X = NH2 L3)形式[(L)Zn] 2+阳离子(L = L1,1; L2,2; L3,3)带有分子内酰胺氧配位(1-3)和分子内NH ... O = C(酰胺)氢由配体骨架牢固固定的键(2,3)。当在50(1)摄氏度下在甲醇中添加Me4NOH.5H2O(1当量)时,1-3进行叔丁基酰胺的裂解。在这些条件下,酰胺的半衰期t(1/2)粘结时间为0.4 h,持续1 2小时9小时,3小时320小时。(6-NHCOtBu-2-吡啶基甲基)-R2(R2 = N(