The Role of Amino Acid Esters and the Amide Group in the Chiral Induction Process by a Novel Monoamide-Linked Monozinc Bisporphyrinate

2014 ◽  
Vol 640 (10) ◽  
pp. 2078-2085 ◽  
Author(s):  
Yinzhi Zhang ◽  
Ben Ma ◽  
Yong Wang ◽  
Chuanjiang Hu
Keyword(s):  
Amino Acid ◽  
Amide Group ◽  
Amino Acid Esters ◽  
Chiral Induction ◽  
Induction Process ◽  
Acid Esters

Incorporating Amino Acid Esters into Catalysts for Hydrogen Oxidation: Steric and Electronic Effects and the Role of Water as a Base

2012 ◽  
Vol 31 (19) ◽  
pp. 6719-6731 ◽  
Author(s):  
Sheri Lense ◽  
Ming-Hsun Ho ◽  
Shentan Chen ◽  
Avijita Jain ◽  
Simone Raugei ◽  
...  
Keyword(s):  
Amino Acid ◽  
Hydrogen Oxidation ◽  
Amino Acid Esters ◽  
Electronic Effects ◽  
Acid Esters

scholarly journals SOME PROPERTIES OF AN ESTERASE DERIVED FROM PREPARATIONS OF THE FIRST COMPONENT OF COMPLEMENT

1957 ◽  
Vol 106 (2) ◽  
pp. 327-343 ◽  
Author(s):  
Oscar D. Ratnoff ◽  
Irwin H. Lepow
Keyword(s):  
Amino Acid ◽  
Human Serum ◽  
Hydrolytic Enzymes ◽  
Physiological Role ◽  
Amino Acid Esters ◽  
Synthetic Amino Acid ◽  
Early Hypothesis ◽  
Antigen Antibody ◽  
Acid Esters

Studies on an esterase derived from partially purified preparations of the first component of complement are described. The esterase hydrolyzed certain synthetic amino acid esters, among which N-acetyl-L-tyrosine ethyl ester was most susceptible. This was hydrolyzed maximally between pH 7.5 and 8.2, and at 41°C. The esterase could not be identified with other previously described hydrolytic enzymes. An esterase with similar properties could also be eluted from antigen-antibody aggregates which had been treated with serum. Human serum contained a heat-labile inhibitor of the esterase which could not be identified with any of the known components of complement. The esterase was also inhibited by certain reducing agents. The experiments described support the early hypothesis that complement exerts its action enzymatically, but the physiological role of the esterase derived from preparations of complement is not yet clear.

Cellulose chiral induction during the synthesis of cellulose N-phthaloyl-amino acid esters

Cellulose ◽  
2013 ◽  
Vol 20 (4) ◽  
pp. 2057-2067
Author(s):  
Nicolas Vanthuyne ◽  
Christian Roussel
Keyword(s):  
Amino Acid ◽  
Amino Acid Esters ◽  
Chiral Induction ◽  
Acid Esters

Some amino acid esters - An improved preparative method

1978 ◽  
Vol 31 (8) ◽  
pp. 1865 ◽  
Author(s):  
JA Maclaren
Keyword(s):  
Amino Acids ◽  
Amino Acid ◽  
Ethyl Acetoacetate ◽  
Preparative Method ◽  
Amino Acid Ester ◽  
Amide Group ◽  
Amino Acid Esters ◽  
Ester Hydrochloride ◽  
Strong Base ◽  
Acid Esters

This paper describes an improvement to an earlier method for preparing some esters of amino acids. Amino acids react with ethyl acetoacetate and the strong base N,N,N',N'-tetramethylguanidine in dimethylformamide to form the salt of the corresponding enamine. Addition of a substituted benzyl or picolyl halide to this solution results in rapid esterification. The amino-protection can then be removed by cold methanolic hydrogen chloride to give the amino acid ester hydrochloride. For asparagine, protection of the amide group is also necessary. With tryptophan, ethyl acetoacetate cannot be used but can be replaced by acetylacetone. No racemization has been detected.

Asymmetric Preparation of anti-β-Hydroxyα-amino Acid Esters

Synfacts ◽  
2006 ◽  
Vol 2006 (12) ◽  
pp. 1253-1253
Author(s):  
Y. Hamada ◽  
K. Makino ◽  
M. Iwasaki
Keyword(s):  
Amino Acid ◽  
Amino Acid Esters ◽  
Acid Esters
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