Chiral mono- and dicarbamates derived from ethyl (<i>S</i>)-lactate: convenient chiral solvating agents for the direct and efficient enantiodiscrimination of amino acid derivatives by <sup>1</sup>H NMR spectroscopy
作者:Federica Balzano、Gloria Uccello-Barretta
DOI:10.1039/d0ra00200c
日期:——
resonances of enantiomeric mixtures of amino acids bearing a 3,5-dinitrobenzoyl moiety at the amino group and with the carboxyl function derivatized as methyl ester or amide has been probed. Almost every CSA was able to originate enantiodiscrimination in the 1H NMR spectra, with (2S)-1-(3,5-dimethylphenylcarbamoyloxy)-2-(3,5-dinitrophenylcarbamoyloxy)propane (4) standing out for efficiency and versatility
用于 NMR 光谱的新型手性溶剂化剂 (CSA) 是从 ( S )-乳酸乙酯中获得的,这是一种非常便宜的市售产品。通过对其官能团进行一系列简单的化学修饰,获得了单氨甲酰化和二氨甲酰化衍生物,并探索了其作为核磁共振波谱学的 CSA 的潜力。已经探讨了它们区分氨基上带有 3,5-二硝基苯甲酰基部分和衍生为甲酯或酰胺的羧基功能的氨基酸对映体混合物共振的能力。几乎每个 CSA 都能够在1 H NMR 光谱中产生对映体歧视,其中 (2 S )-1-(3,5-二甲基苯基氨基甲酰氧基)-2-(3,5-二硝基苯基氨基甲酰氧基)丙烷 ( 4 ) 因其效率和多功能性而脱颖而出。
Enantioselective and Diastereoselective Binding Study of Silica Bound Macrobicyclic Receptors by HPLC
作者:Francesco Gasparrini、Domenico Misiti、W. Clark Still、Claudio Villani、Helma Wennemers