- Reactivity of Tyrosyl–Proline toward Benzoylation in Aqueous 1,4-Dioxane
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Abstract: The kinetics of the reaction of L-tyrosyl-L-proline (Tyr–Pro) with di- andtrinitrophenyl benzoates in aqueous 1,4-dioxane (40 wt percent of water) were studiedin the temperature range 298–313 K. The reaction rate constant k298 was fou
- Khachatryan, D. S.,Kochetova, L. B.,Kustova, T. P.,Lokteva, I. I.
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p. 1034 - 1040
(2020/07/25)
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- Reactivity of α-Amino Acids in the Reaction with Esters in Aqueous–1,4-Dioxane Media
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The kinetics of the reaction of a series of α-amino acids with 4-nitrophenyl acetate, 4-nitrophenyl benzoate, and 2,4,6-trinitrophenyl benzoate in aqueous 1,4-dioxane medium has been studied. Kinetics of the reactions involving 4-nitrophenyl acetate and 2,4,6-trinitrophenyl benzoate has complied with the Br?nsted dependence and revealed linear correlation between rate constant logarithm and the energy difference of the frontier orbitals of α-amino acids anions.
- Kochetova,Kustova,Kuritsyn
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- Skin care
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PROBLEM TO BE SOLVED: To provide a skin care preparation suitable for a cosmetic (including quasi medicine). SOLUTION: The skin care preparation comprises a compound represented by general formula (1) [wherein R1is a hydrogen ato
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Paragraph 0089-0091; 0116-0117
(2020/10/16)
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- PREVENTING OR AMELIORATING AGENT FOR PIGMENTATION
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An object is to provide an external preparation for skin preferably usable to prevent or ameliorate pigmentation. The object is achieved by providing a preventing or ameliorating agent for pigmentation, consisting of a compound represented by the following general formula (1), an isomer thereof, and/or a pharmacologically acceptable salt thereof, and an external preparation for skin containing the same as a component: [wherein R1 represents an unsubstituted aromatic group or an aromatic group having any substituent; R2 represents a hydrogen atom, a linear chain or branched chain alkyl group having a number of carbon atom or atoms of 1 to 4, or an acyl group having a linear or branched alkyl chain having a number of carbon atom or atoms of 1 to 4; and R3 represents a hydrogen atom or a linear chain or branched chain alkyl group having a number of carbon atom or atoms of 1 to 4.]
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- Reactivity of the Amino Groups of α-Amino Acids and Dipeptides in Reaction with Benzoyl Chloride in a Dioxane-Water Solvent
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The kinetic characteristics (rate constants, activation energies, and entropies of activation) for the reaction of a series of α-amino acids and dipeptides with benzoyl chloride in aqueous dioxane are presented.The amino group in the investigated α-amino acids has high reactivity 4 liter/mole*sec>; the dipeptides have lower reactivity 3 liter/mole*sec>.
- Kuritsyn, L. V.,Kalinina, N. V.
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p. 767 - 770
(2007/10/02)
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- Catalytic Asymmetric Construction of Morpholines and Piperazines by Palladium-Catalyzed Tandem Allylic Substitution Reactions
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Reaction of 1,4-diacetoxy-cis-2-butene (1a) with 2-(benzylamino)ethanol (2a) was catalyzed by a palladium complex (5 mol percent) coordinated with (R)-2,2'-bis(diphenylphosphino)-1,1'-binaphthyl to give optically active (R)-4-benzyl-2-vinylmorpholine (3a)
- Uozumi, Yasuhiro,Tanahashi, Asako,Hayashi, Tamio
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p. 6826 - 6832
(2007/10/02)
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- Composition containing a penem or carbapenem antibiotic and the use of the same
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Administration of an N-acylated amino acid in association with a penem or carbapenem antibiotic relieves or eliminates the renal problems associated with administration of the antibiotic alone. The amino acid derivative and antibiotic may be formulated together as a composition or administered separately, either simultaneously or sequentially.
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- Composition containing a penem or carbapenem antibiotic
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Administration of an N-acylated amino acid in association with a penem or carbapenem antibiotic relieves or eliminates the renal problems associated with administration of the antibiotic alone. The amino acid derivative and antibiotic may be formulated together as a composition or administered separately, either simultaneously or sequentially. The composition may be prepared by simple mixing.
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