1957
DOI: 10.1021/jo01362a052
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Studies on Arginine Peptides. I. Intermediates in the Synthesis of N-Terminal and C-Terminal Arginine Peptides*

Abstract: Tricarbobenzoxy-L-arginine, as its sodium salt, was prepared in strongly alkaline medium via the carbobenzoxylation of L-arginine. This sodium salt, which was in fact a mixture of at least two different isomeric forms, was converted into a mixture of jV"V,"-dicarbobenzoxy-L-arginine and a single pure isomer of sodium tricarbobenzoxy-L-argininate upon treatment with boiling ethanol. Fractionation of these compounds, followed by acidification of the latter material, yielded pure tricarbobenzoxy-L-arginine wherei… Show more

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Cited by 202 publications
(59 citation statements)
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“…[24] Dibenzylglutamate paratoluenesulfonate (DBG) was synthesized according to ref. [25]. Similarly, 1-aminoundecanoic acid (AUDA) was esterified with benzyl alcohol, followed by azeotropic removal of the water by a Dean ± Stark distillation in benzene in the presence of para-toluenesulfonic acid (5 % excess).…”
Section: Methodsmentioning
confidence: 99%
“…[24] Dibenzylglutamate paratoluenesulfonate (DBG) was synthesized according to ref. [25]. Similarly, 1-aminoundecanoic acid (AUDA) was esterified with benzyl alcohol, followed by azeotropic removal of the water by a Dean ± Stark distillation in benzene in the presence of para-toluenesulfonic acid (5 % excess).…”
Section: Methodsmentioning
confidence: 99%
“…RF ( (4). To a solution of L-leucine benzyl ester toluene-psulphonate [19] (0.78 g, 2 mmol) in N,N-dimethylformamide (10 ml) was added 0.28 ml triethylamine (2 mmol), followed by S-Ph3C-CH2-CH2-CO-~-Pro-ONPh (0.85 g, 1.5 mmol).…”
Section: S-trityl-2-mercuptopropionyl-~-proline-p-nitrophenyl Ester (mentioning
confidence: 99%
“…To date, the principal method of amino acid ester synthesis using alcohols has been the Fischer-Speier esterification procedure [17], in which an amino acid and an alcohol are dehydrated in the presence of an acid catalyst, such as hydrogen chloride [18], sulfuric acid [19], polyphosphoric acid [20], p-toluenesulfonic acid [21,22], ion-exchange resins (e.g., Amberlyst® 15) [23], or trimethylchlorosilane [24]. However, as the amino group present in amino acids can form an amide moiety through bonding with the carboxylic group of another molecule, the amino group must be protected prior to esterification.…”
Section: Introductionmentioning
confidence: 99%