摘要:
A catalytic glycosylation method comprising: installing thioether to an anomeric carbon of a carbohydrate; and catalytically activating the thioether with a non-oxophilic Lewis acid. The thioether may comprise an anomerically stable thioether leaving group. The catalytic glycosylation method may further comprise: utilizing an acid-sensitive ester protecting group as permanent protecting group or using a reactivity-based one-pot glycosylation that employs a single-component catalyst to accelerate an oligosaccharide assembly process. A protecting group to mask hydroxyl functionalities in the production of oligosaccharides, natural products or any molecule having a hydroxyl group comprising an acid-labile ester protecting group.
摘要:
A process for the preparation of solid amine salts of aromatic substituted carboxylic acid herbicides by reaction of the aromatic substituted carboxylic acid herbicide with an amine comprising reacting the aromatic substituted carboxylic acid herbicide in an ether solvent with an amine to form the amine salt and collecting the amine salt of the aromatic substituted carboxylic acid herbicide as a precipitate from the ether solvent reaction mixture wherein the ether is a dialiphatic ether comprising at least one primary aliphatic group.
摘要:
A preparation method and its use of derivatization reagent for detecting L-carnitine or D-carnitine are provided. The present reagent is stable. It can be used for detecting L-carnitine or D-carnitine accurately and sensitively. That is to say, the reagent is applied to detecting the amount of synthesized or natural L-carnitine and the amount of mixing D-carnitine. The compound reagent is used for determining the chiral isomers of chemicals, biological reagents, health care reagents, cosmetic, body fluids and various foods, which contain L-carnitine or/and D-carnitine, and optical isomers of other chiral amino acids.
摘要:
Uric acid in mammalian subjects is reduced and excretion of uric acid is increased by administering a compound of Formula I or a pharmaceutically acceptable salt thereof. In Formula I m is 0, 1, 2, 3 or 4; n is 0 or 1; m+n is not more than 4;t is 0 or 1; q is 0 or 1; and r is 0, 1 or 2. R6 is hydrogen, methyl or ethyl and R12 is hydrogen or methyl, or R6 is hydroxy and R12 is hydrogen, or R6 is O and R12 is absent, or R6 and R12 together are —CH2CH2—. R7 is hydrogen or alkyl having from 1 to 3 carbon atoms. One of R8 and R9 is alkyl having from 1 to 3 carbon atoms, and the other is hydrogen or alkyl having from 1 to 3 carbon atoms. R10 is hydrogen, halo, alkyl having from 1 to 3 carbon atoms or alkoxy having from 1 to 3 carbon atoms. X is C(O) and r is 0 and t is 0; or X is NH(R11) wherein R11 is hydrogen or alkyl having from 1 to 3 carbon atoms. A is phenyl, unsubstituted or substituted by 1 or 2 groups selected from halo, hydroxy, methyl, ethyl, perfluoromethyl, methoxy, ethoxy, and perfluoromethoxy; or a 5 or 6 membered heteroaromatic ring having 1 or 2 ring heteroatoms selected from N, S and O and the heteroaromatic ring is covalently bound to the remainder of the compound of Formula I by a ring carbon; or cycloalkyl having from 3 to 6 ring carbon atoms wherein the cycloalkyl is unsubstituted or one or two ring carbons are independently monosubstituted by methyl or ethyl. The uric acid-lowering effects of the Compounds of Formula I are used to treat or prevent a variety of conditions including gout, hyperuricemia, elevated levels of uric acid that do not meet the levels customarily justifying a diagnosis of hyperuricemia, renal dysfunction, kidney stones, cardiovascular disease, risk for developing cardiovascular disease, tumor-lysis syndrome, and cognitive impairment.
摘要:
The invention provides novel compounds of formula (I), wherein: R1 is a radical derived from one of the known ring systems; R2 is a phenyl radical optionally substituted; Xn represents a birradical selected from the group consisting of: —(CH2)1-4—, (C2-C4)-alkenyl, (C2-C4)alkynyl, —S—(CH2)1-3—#, and —(CH2)1-3—O—#; wherein the symbol # indicates the position at which Xn is attached to R1; Yn is a birradical selected from the group consisting of: —(CH2)2-4—, —S—(CH2)1-3#, and —O—(CH2)1-3—#; wherein the symbol # indicates the position at which Yn is attached to R2; and R3 is a radical selected from the group consisting of: —OR4. The compounds of formula (I) are useful in the treatment of cancer.
摘要:
To find a therapeutic agent and/or a preventive agent for diabetes mellitus or the like having excellent activity and safety. A compound represented by the following general formula (I), or a pharmacologically acceptable salt thereof. In the formula, X represents ═C(R5)- or ═N—; Y represents —O— or —NH—; L represents a bond or a substitutable C1-C3 alkylene group; M represents a substitutable C3-C10 cycloalkyl group, a substitutable C6-C10 aryl group, or a substitutable heterocyclic group; R1 represents a C1-C6 alkyl group, a C3-C10 cycloalkyl group, a C1-C6 haloalkyl group, a C2-C6 alkenyl group, a C2-C6 alkynyl group, a C1-C6 aliphatic acyl group, a C1-C6 alkoxy C1-C6 alkyl group, or a C6-C10 aryl group; and R2, R3, R4, and R5 may be the same or different and each represent a hydrogen atom, a halogen atom, a C1-C3 alkyl group, a C1-C3 haloalkyl group, a C1-C3 alkoxy group, or a nitro group. In this connection, the alkyl group moieties of R1 and R2 may be bonded to each other to form a 5- to 6-membered heterocyclic ring containing one oxygen atom.
摘要:
The present invention relates to novel, non-secosteroidal, diaryl compounds with vitamin D receptor (VDR) modulating activity that are less hypercalcemic than 1a,25 dihydroxy vitamin D3. These compounds are useful for treating bone disease and psoriasis.
摘要:
The present invention relates to compounds of formula (I) wherein Ar, Ar2, R2, R3, R4, m, p and s are as defined in the description and claims, and pharmaceutically acceptable salts thereof. The compounds are useful for the treatment and/or prophylaxis of diseases that are associated with the activation of the glycogen synthase enzyme, such as diabetes.
摘要:
A peroxisome proliferator activated receptor regulator containing a carboxylic acid derivative of formula (I) (wherein all symbols are as defined in the specification), a non-toxic acid thereof or a hydrate thereof as active ingredient. Because of having an effect of regulating PPAR, a compound of formula (I) is useful as a hypoglycemic agent, a hypolipidemic agent, a preventive and/or a remedy for diseases associating metabolic disorders (diabetes, obesity, syndrome X, hypercholesterolemia, hyperlipoproteinemia, etc.), hyperlipemia, atherosclerosis, hypertension, circulatory diseases, overeating, coronary heart diseases, etc., an HDL cholesterol-elevating agent, an LDL cholesterol and/or VLDL cholesterol-lowering agent and a drug for relief from risk factors of diseases or syndrome X.