Synthesis of Charge-Compensated <i>nido</i>-Carboranyl Derivatives of Sulfur-Containing Amino Acids and Biotin
作者:Dmitry A. Gruzdev、Angelina A. Telegina、Galina L. Levit、Marina A. Ezhikova、Mikhail I. Kodess、Victor P. Krasnov
DOI:10.1021/acs.joc.3c01569
日期:2023.10.6
A new group of charge-compensated nido-carboranyl derivatives of sulfur-containing amino acids and biotin has been synthesized in which the boron atom in position 9 or 10 of carborane is attached to a positively charged sulfur atom. The possibilities of obtaining symmetrical B(10)-substituted and asymmetric B(9)-substituted nido-carboranes were studied. Using the example of (S)-methionine and D-biotin
Kinetic Resolution of Protected α-Amino Acid Derivatives by a Chiral <i>O</i>-Nucleophilic Acyl Transfer Catalyst
作者:Gregory T. Notte、Tarek Sammakia
DOI:10.1021/ja058010t
日期:2006.4.5
The kinetic resolution of alpha-trifluoroacetamido N-acyl oxazolidinethiones using 5-10% of the chiral, nonracemic O-nucleophilic acyl transfer catalyst 2 is described. A variety of substrates participate in this reaction in excellent yields, with s-factors ranging from 20 to 86.
N-Trifluoracetyl-aminosäuren, XIX. Gaschromatographische Trennung von<i>N</i>-TFA-Dipeptid-methylestern
作者:Friedrich Weygand、Bruno Kolb、Axel Prox、Monohar A. Tilak、Ichiro Tomida
DOI:10.1515/bchm2.1960.322.1.38
日期:1960.1
Weygand,F. et al., Zeitschrift fur Naturforschung. Teil B: Chemie, Biochemie, Biophysik, Biologie, 1963, vol. 18, p. 93 - 104
作者:Weygand,F. et al.
DOI:——
日期:——
Mild regeneration of the carboxylic group of amino acid alkyl esters by aqueous methanolic sodium hydrogen carbonate via 5-oxazolidinones
作者:Pietro Allevi、Mario Anastasia
DOI:10.1016/j.tetlet.2003.08.028
日期:2003.10
A simple racemization-free procedure allows the regeneration of the carboxylic acid group of aminoacid alkyl esters by way of an intermediate 5-oxazolidinone which is hydrolyzed by treatment with sodium hydrogen carbonate in aqueous methanol.