51887-89-9Relevant articles and documents
Method for synthesizing L -selenium - methylselenocysteine
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Paragraph 0049-0050, (2021/11/27)
The invention provides a method for synthesizing L -selenium - methylselenocysteine, and relates to the reaction of a compound of formula II or a salt thereof with dimethyl diselenoate, and the method comprises MBH. 4 The method comprises the following steps: directly synthesizing L - selenium - methylselenocysteine through a one-pot reaction under the action of alkali or synthesizing L - selenium - methylselenocysteine, and hydrolyzing to obtain L - selenium - methylselenocysteine. The synthesis method has the advantages of simple reaction. The method has the advantages of convenient operation, high product yield, good quality, low cost and suitability for industrialization.
Reactivity of Selenocystine and Tellurocystine: Structure and Antioxidant Activity of the Derivatives
Satheeshkumar, Kandhan,Raju, Saravanan,Singh, Harkesh B.,Butcher, Ray J.
supporting information, p. 17513 - 17522 (2018/11/23)
l-Selenocystine (5) and l-tellurocystine (6) have been prepared and the reactivity of these amino acids, i.e., oxidation of 5 and 6, has been performed at various pH values. Hydrogen peroxide was used as an oxidant and it was treated with 5 and 6 in excess in acidic and basic media. Compound 5, upon oxidation, afforded SeIV and SeVI products. Selenocysteic acid [HO3SeCH2CH(NH2)COOH] 9, a novel SeVI compound, was isolated and characterised by single-crystal X-ray diffraction studies. In contrast, l-tellurocystine, upon oxidation with H2O2, afforded TeII and TeIV products. Zwitterionic organotellurolate(IV), [TeCl3CH2CH(NH3)COOH] 13, was isolated and characterised by NMR and IR spectroscopy, mass spectrometry and elemental analysis. Compound 13 crystallizes in an orthorhombic space group. l-Tellurocystine, when reduced with NaBH4, produced the desired tellurolate intermediate, which was trapped with bromoacetic acid. Furthermore, l- and d-tellurocysteine derivatives, [(RTeCH2CH(NH2)COOH) R=phenyl, substituted phenyl and naphthyl (24–39)] were synthesised and evaluated for their glutathione peroxidase (GPx)-like activities. The results show that l-tellurocysteine derivatives have higher activity than their D-tellurocysteine analogues. DFT calculations for l-tellurocysteine derivatives provided information about the bond lengths and bond angles. This study reveals that the introduction of naphthyl substituents (35–38) leads to twisted conformation of the amino acid derivatives.
Preparation method for L-selenocysteine
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Paragraph 0023; 0024, (2016/12/26)
The invention belongs to the field of chemical synthesis, and concretely relates to a synthetic method for L-selenocysteine. The method comprises the following steps: a, chloridizing L-serine hydrochloride to obtain 3-chloro-L-alanine hydrochloride; b, performing seleno-reaction of 3-chloro-L-alanine hydrochloride prepared by step a under alkaline condition to obtain L-selenocystine; and c, performing reduction reaction of L-selenocystine to obtain L-selenocysteine. The method has simple steps, high yield, low cost, and good application prospect.
Processes for producing β-halogeno-α-amino-carboxylic acids and phenylcysteine derivatives and intermediates thereof
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Example 6, (2010/01/31)
An industrially advantageous method of producing β-halogeno-α-aminocarboxylic acids is provided. Methods are also provided of producing optically active N-protected-S-phenylcysteines having high optical purity and of intermediates thereof, respectively, in which the above production method is utilized. A method of producing β-halogeno-α-aminocarboxylic acids or salts thereof is disclosed which comprises halogenating the hydroxyl group of a β-hydroxy-α-aminocarboxylic acid (in which the basicity of the amino group in α-position is not masked by the presence of a substituent on said amino group) or a salt thereof with an acid with a halogenating agent. A method of producing optically active N-protected-S-phenylcysteines represented by the general formula (3) or salts thereof is further disclosed which comprises applying the above production method to optically active serine or a salt thereof and then carrying out treatment with an amino-protecting agent and reaction with thiophenol under a basic condition.
Direct synthesis of Fmoc-protected amino acids using organozinc chemistry: Application to polymethoxylated phenylalanines and 4-oxoamino acids
Deboves,Montalbetti,Jackson
, p. 1876 - 1884 (2007/10/03)
The newN-Fmoc 3-iodoalaninetert-butyl ester derived organozinc reagent1, obtained in 7 steps from optically pure 3-serine, was coupled to a range of electrophiles under palladium catalysis to give substituted phenylalanines and 4-oxoamino acids in variabl