Mechanoresponsive, proteolytically stable and biocompatible supergelators from ultra short enantiomeric peptides with sustained drug release propensity
residue bound to the dihexadecylamine component (N+C5HisAla2C16) afforded tubular aggregates in the aqueous dispersion. The hydrolysis of enantiomeric esters of various hydrophobic nature, which was carried out in the single-walled vesicles, showed relatively small enantioselectivity. The reasons for...
was markedly elevated at temperatures somewhat higher than the phase transitions for the hydrolysis of hydrophobic amino acid esters (p-nitrophenyl N-dodecanoyl-D(L)-phenylalaninate) by a hydrophobic dipeptide (tetradecanoyl-L-histidyl-L-leucine) in the artificialmembrane (dialkyldimethylammonium bromides) systems.
A novel chiral lipophilic sulfur-containing macrocyclic ligand 5 with bis-pendant alcohols in the proximity of the coordination center has been synthesized. Its metal ion complexes have been investigated as catalysts for the enantioselective hydrolysis of long chain α-aminoacidesters in aqueous comicellar solution with Brij35. Large rate accelerations (up to 220 times) and moderate enantioselectivities
合成了在配位中心附近具有双侧链醇的新型手性亲脂性含硫大环配体5。已经研究了其金属离子络合物作为催化剂在Brij35水溶液中对长链α-氨基酸酯进行对映选择性水解的方法。已经观察到使用大环5- Cu 2+的大速率加速(高达220倍)和中等对映选择性(高达4.85(k S / k R)),而无环3- Cu 2+表现出较低的反应性和立体选择性。取类似的配体4,缺少羟基会导致速率急剧下降,并且观察到对映选择性反转。在我们的胶束反应条件下,与Cu 2+结合的羟基的pKa值确定为pKa = 7.2。
Synthesis of novel chiral lipophilic pyridyl-containing β-amino alcohol ligands and enantioselective hydrolysis of α-amino acid esters by chiral metallomicelles
Seven novel chiral lipophilic pyridyl-containing β-amino alcohol ligands have been synthesized by coupling of 6-alkoxymethyl-2-chloromethylpyridine 3 with the corresponding chiral β-amino alcohols or l-cysteine. Their metal ion complexes have been investigated as catalysts for the enantioselective hydrolysis of N-protected α-aminoacidesters in aqueous comicellar solution. The results indicate that
通过将6-烷氧基甲基-2-氯甲基吡啶3与相应的手性β-氨基醇或1-半胱氨酸偶联,已经合成了七个新颖的手性亲脂性吡啶基含β-氨基醇配体。已经研究了它们的金属离子配合物作为催化剂,用于在漫画溶液中对N-保护的α-氨基酸酯进行对映选择性水解。结果表明,底物与金属催化剂之间的疏水相互作用,配体的刚度,配体的羟基充当亲酰基化的酰基转移过程以及胶束微环境是影响活性和对映选择性的重要因素。大速率加速度(高达三个数量级)和中等对映选择性(高达7.81(k已经观察到采用4a -Cu 2+的R / k S))。
Enantioselective ester hydrolysis by an achiral catalyst co-embedded with chiral amphiphiles into a vesicle membrane
作者:M. Poznik、B. König
DOI:10.1039/c6ra06628c
日期:——
Co-embedding of an amphiphilic non-chiral hydrolysis catalyst with amphiphilic chiral additives into the membrane of a phospholipid vesicle induces different rates of esterhydrolysis for enantiomeric amino acid esters.