Enantioselective Liquid–Liquid Extractions of Underivatized General Amino Acids with a Chiral Ketone Extractant
摘要:
The chiral ketone (S)-3 shows high kinetic enantioselectivities toward the L form for general underivatized amino acids with hydrophobic side chains and a high thermodynamic enantioselectivity toward the D form for cysteine with its -SH polar side chain when used as an extractant in enantioselective liquid-liquid extractions in the presence of Aliquat 336. Consecutive extractions by imine formation and hydrolysis increase the enantiopurity of the amino acid, as both of these reactions are L-form-selective.
DOI:
10.1021/ja3105945
作为产物:
描述:
(2S)-2-氨基-3-苯基丙酸乙酯 在
水 、 sodium hydroxide 作用下,
以95%的产率得到DL-phenylalanine sodium salt
参考文献:
名称:
Process for preparing hyperpolarized substrates and method for MRI
作者:Bernard Garrigues、Aurelio Munoz、Max Koenig、Michel Sanchez、Robert Wolf
DOI:10.1016/0040-4020(77)80303-7
日期:1977.1
New spirophosphoranes have been prepared by reaction of &alpha-aminoacids with tricoordinate phosphorus substrates. In one case, 1i, an equilibrium chain-cycle PIIIPv has been observed.
通过α-氨基酸与三配位磷底物的反应已制备了新的螺正膦。在一种情况1i中,已经观察到平衡链循环P III P v。
Single‐Step, Rapid, and Mild Synthesis of β‐Amino Acid
<i>N</i>
‐Carboxy Anhydrides Using Micro‐Flow Technology
β-Amino acid N-carboxy anhydrides (β-NCAs) are rarely used in the synthesis of β-peptides, which is due mainly to the poor availability of these potentially useful substrates. Herein, we describe the heretofore challenging synthesis of β-NCAs via a single-step, rapid, and mild formation using pH flash switching and flash dilution, which are aspects of micro-flow technology. We synthesized 15 β-NCAs
Rapid and Mild Synthesis of Amino Acid <i>N</i>
-Carboxy Anhydrides: Basic-to-Acidic Flash Switching in a Microflow Reactor
作者:Yuma Otake、Hiroyuki Nakamura、Shinichiro Fuse
DOI:10.1002/anie.201803549
日期:2018.8.27
Polymerization of N‐carboxyanhydrides (NCAs) is the primary process used to prepare polypeptides. The synthesis of various pure NCAs is key to the efficient synthesis of polypeptides. The only practical method that can be used to synthesize NCAs requires harsh acidic conditions that make acid‐labile substrates unusable and results in an undesired ring opening of NCAs. Basic‐to‐acidic flash switching
Efficient Synthesis of Chiral Binaphthol Aldehyde with Phenyl Ether Linkage for Enantioselective Extraction of Amino Acids
作者:Misun Choi、Moo-Jin Jun、Kwan Mook Kim
DOI:10.1002/bkcs.10354
日期:2015.7
starting from binaphthol‐3‐carboxylicacid. The axially chiral binaphthol ring was racemized during the synthesis due to high temperatures required in O‐phenylation reaction. The enantiomericallypure form of 2 was obtained from the resolution of the diastereomeric imine of 2. Optically pure compound (S)‐2 was applied to the enantioselective liquid–liquid extraction of amino acid between CH2Cl2 and aqueous