A Series of Amino Acid Functionalized Tripodal Hexaamide Anion Receptors: Ion-Pair-Assisted Capped-Cleft Formation by a Pentafluorophenyl-Functionalized Amide
作者:Purnandhu Bose、Iyyamperumal Ravikumar、Bidyut Akhuli、Pradyut Ghosh
DOI:10.1002/asia.201200428
日期:2012.10
A new series of tris(2‐aminoethyl)amine (tren)‐based L‐alanine amino acid backboned tripodal hexaamide receptors (L1–L5) with various attached moieties based on electron‐withdrawing fluoro groups and lipophilicity have been synthesized and characterized. Detailed binding studies of L1–L5 with different anions, such as halides (F−, Cl−, Br−, and I−) and oxyanions (AcO−, BzO− (Bz=benzoyl), NO3−, H2PO4−
合成并表征了一系列新的基于三(2-氨基乙基)胺(tren)的L-丙氨酸氨基酸骨架的三脚架六酰胺受体(L1-L5),该基团具有基于吸电子氟基团和亲脂性的各种连接部分。详述结合L1-L5的研究,不同的阴离子,如卤化物(F - ,氯- ,溴-和I - )和氧阴离子(ACO -,BZO -(BZ =苯甲酰基),NO 3 -,H 2 PO 4 -和HSO 4 -),已通过等温量热滴定(ITC)实验在乙腈/二甲亚砜(99.5进行:0.5 V / V)在298K ITC滴定实验已清楚地表明受体L1-L4形成总是1:1复合有Cl -,ACO -,BZO -和HSO 4 - ,而L5形成1:1的复合物仅与ACO - 。在溴的情况下- ,我-和NO 3 - ,没有明显的热变化是由于这些阴离子和受体之间的弱相互作用观察到 1 H NMR光谱进一步证实了这一点。美国国际贸易委员会结合的F研究-和H 2PO 4 -