摘要:
The present invention is directed to a composition and method relating to the preparation of aspartyl peptides having the general formula: ##STR1## where the radical-NHR represents an amino acid or peptide group. In the method, a .beta.-monoester of aspartic acid having the general formula: ##STR2## where R.sub.1 represents a hydrocarbon-containing radical, is reacted with a .beta.-dicarbonyl compound, preferably ethylacetoacetate to protect the aspartyl amino group and form an enamine. The enamine is then coupld to an amino acid or peptide, following which any protecting groups are removed to yield .alpha.-aspartyl peptides without any .beta.-isomer. In its composition aspects, the present invention is directed to novel enamines resulting from reaction of the .beta.-monoester of aspartic acid with a .beta.-dicarbonyl compound.
摘要:
Carbonyl derivatives of acetaminophen are provided for use in homogeneous enzyme immunoassays for acetaminophen. The derivatives are conjugated to antigenic substances for the preparation of antisera specific to acetaminophen, and to enzymes for the preparation of enzyme conjugates which compete with acetaminophen for antibody binding sites in a typical assay.
摘要:
Betaine-amine oxides of the formula ##STR1## in which R denotes alkyl, alkenyl or hydroxyalkyl, each of which has 8-22 carbon atoms, R.sup.1 denotes hydrogen or methyl, R.sup.2 denotes ethylene, propylene or 2-hydroxypropylene, R.sup.3, R.sup.4 and R.sup.5 can be identical or different and denote C.sub.1 -C.sub.3 -alkyl or a group of the formula ##STR2## or R.sup.3 denotes a group of the formula --R.sup.2 --BR.sup.4 R.sup.5, X denotes a direct bond or a group of the formula--CO--,A and B denote a group of the formulae ##STR3## it being necessary for at least one amine oxide group and at least one betaine group to be present, a denotes 0 or 1, b denotes 1, 2 or 3, n denotes a number from 0 to 10 and m denotes 1, 2 or 3. These compounds are obtained by partially quaternizing the parent polyamines with the alkali metal salt of an .omega.-halogenocarboxylic acid and then oxidizing the non-quaternized nitrogen atoms. These betaine-amine oxides are suitable for use as surfactants in cleansing agents.
摘要翻译:其中R表示烷基,烯基或羟烷基,其中每一个具有8-22个碳原子,R1表示氢或甲基,R2表示乙烯,丙烯或2-羟基亚丙基,R3,R4和 R 5可以相同或不同,表示C 1 -C 3 - 烷基或式“基团”或R 3表示式-R 2 -BR 4 R 5的基团,X表示直接键或式-CO-的基团, A和B表示至少一个氧化胺基团和至少一个甜菜碱基团所需的一组式(IMAGE),a表示0或1,b表示1,2或3,n表示数 0至10,m表示1,2或3.这些化合物通过将母体多胺与ω-卤代羧酸的碱金属盐部分季铵化,然后氧化未季铵化的氮原子而获得。 这些甜菜碱 - 胺氧化物适合用作清洁剂中的表面活性剂。
摘要:
Compounds of the general formula ##STR1## wherein Ph is a phenyl group which is optionally substituted by one or more substituents selected from halo (i.e. fluoro, chloro, bromo or iodo), C.sub.1-4 alkyl, amino, C.sub.1-4 alkylamino, di-C.sub.1-4 alkylamino, nitro, sulphonyl, aminosulphonyl, trihalomethyl, carboxy, C.sub.1-4 alkoxycarbonyl, amido, C.sub.1-4 alkylamido, C.sub.1-4 alkoxy, C.sub.2-4 alkenyl, cyano, aminomethyl, or methylsulphonyl; Y is a group of formula ##STR2## where R.sup.1 is hydrogen or methyl; R.sup.2 is alkyl of 1 to 3 carbon atoms or is methylthiomethyl; and Z is --OR.sup.3 or --NR.sup.4 R.sup.5 where R.sup.3, R.sup.4 and R.sup.5 are each hydrogen or alkyl of 1 to 4 carbon atoms and R.sup.3 can further be phenylalkyl having 1 to 3 carbon atoms in the alkylene moiety thereof, or phenyl; and basic salts thereof. These compounds have an advantageous enkephalinase inhibitory activity which renders the compounds useful in medical therapy, e.g. to prolong and/or potentiate in a mammal, the effects of endogenous or exogenous enkephalins. The latter includes synthetic enkephalin analogues.
摘要:
The reaction of an imidazoline base of the formula: ##STR1## wherein R represents an aliphatic group comprising from 6 to 22 carbon atoms and R.sub.1 represents a substituted or unsubstituted alkyl or alkenyl group comprising 1 to 4 carbon atoms, with a carbo-alkylating agent is carried out in two stages. Initially the pH is maintained in the range 7 to 11 and subsequently it is maintained in the range 9 to 12.5. These conditions encourage at least part of the imidazoline to undergo alkylation followed by hydrolysis and further alkylation. The di alkylated amidoamines thus produced are believed to be novel. The reaction products are surfactants which exhibit very low skin irritancy and have a desirably low viscosity. They find particular application in shampoo formulations.
摘要:
A novel crystalline form of anhydrous L-lysine monohydrochloride has been found. The novel crystals do not become agglomerated or hardened when packaged. The crystals are formed when the corresponding dihydrate crystals having a sodium content equal to or less than 4 ppm* are dried in a chamber maintained at a temperature equal to or greater than 115.degree. C.*Na/L-Lys.HCl
摘要翻译:已经发现无水L-赖氨酸单盐酸盐的新型结晶形式。 当包装时,新颖的晶体不会凝聚或硬化。 当将钠含量等于或小于4ppm *的相应二水合物晶体在保持在等于或大于115℃的温度的室中干燥时,形成晶体。* Na / L-Lys。
摘要:
N-mono-substituted derivatives of diamino acids are prepared by the reaction of succinimidyl esters of carboxylic acids or substituted carbonic acids with the unprotected diamino acid. The acylation preferentially occurs at the side chain or terminal amino group of the diamino acid. For example, selective acylation of the terminal amino group of lysine occurs without first having protected the 2-amino group. Such acylation has application in the preparation of inter alia N.sup.6 -palmitoyl-lysine.
摘要:
New amphoteric compounds which contain two basic groups, at least one of which is a quaternary ammonium group, and an anionic group of the carboxylic type and one or two lipophile chains. These compounds have excellent cationic characteristics while being less, and in some cases non-irritating to the mucous membrane of the eye.
摘要:
DISCLOSED AS NOVEL COMPOUNDS ARE N$-BENZYLOXYCARBONYL-ORNITHINE, 2-BROMO-N-BENZYLOXCARBONYL-5-AMINOPENTANOIC ACID, N$-BENZLOXYCARBONYL - A -HYDRAZINOORNITHINE, AND A-HYDRAZINO-ORNITHINE, TOGETHER WITH ITS SALTS. THE FIRST OF THESE COMPOUNDS HAVE UTILITY AS INTERMEDIATES IN THE PREPARATION OF THE A-HYDRAZINO-ORNITHINE COMPOUNDS. THE LATTER COMPOUNDS HAVE UTILITY AS MICRROBICIDES AND AS INHIBITORS OF ORNITHINE DECARBOXYLASE.