829results about "Sulfonic acid esters preparation" patented technology

The invention provides substituted diaryl compounds as shown in general formula (I) or their pharmaceutically acceptable salts, and also provides a preparation method; a class of novel broad-spectrum antiviral compounds and pharmaceutical salts targeting cytokines are screened and obtained through studies on structure-activity relationship and action mechanism of active compounds; the compounds not only have significant broad-spectrum antiviral activity, but also have the advantages of low toxicity and good pharmaceutical properties.

A method for the preparation of graphene is provided, which includes: (a) oxidizing a graphite material to form graphite oxide; (b) dispersing graphite oxide into water to form an aqueous suspension of graphite oxide; (c) adding a dispersing agent to the aqueous suspension of graphite oxide; and (d) adding an acidic reducing agent to the aqueous suspension of graphite oxide, wherein graphite oxide is reduced to graphene by the acidic reducing agent, and graphene is further bonded with the dispersing agent to form a graphene dispersion containing a surface-modified graphene. The present invention provides a method for the preparation of graphene using an acidic reducing agent. The obtained graphene can be homogeneously dispersed in water, an acidic solution, a basic solution, or an organic solution.

The invention discloses a method for synthesizing a novel tetracyclic diterpene compound from stevioside, which is cost-efficient and feasible. The compound is represented by a general formula (I), wherein the definitions of R1, R2, X, Y are shown in the specification. The invention discloses a potential application value of the compound in the aspects of anti-tumor and anti-inflammation and a detailed preparation method of the compound as well as physical data of Fourier transform infrared spectroscopy (FT-IR), hydrogen nuclear magnetic resonance spectroscopy (1 HNMR), mass spectrometry (MS) and the like.

The invention relates to the field of chemical synthesis of medicines and in particular relates to a preparation method and intermediate of an AHU-377 intermediate and a preparation method of the intermediate. The preparation method of the AHU-377 intermediate shown in a formula (I) in the description comprises the following steps: performing a substitution reaction on a compound shown in a formula (II) in the description and a compound shown in a formula (III) in the description and then carrying out hydrolysis to prepare the AHU-377 intermediate shown in the formula (I), wherein the hydrolysis reaction is carried out in the presence of hydrogen peroxide and lithium hydroxide hydrate. The invention also aims to provide a new compound with a structure shown in the formula (II). In the new route, as a new compound shown in a formula (IV) in the description is prepared through reaction of the compound in the formula (II) and the compound in the formula (III), the selectivity is quite good, and a few diastereoisomers are generated in the reaction process and can be removed only through simple aftertreatment.

The invention relates to side substitution aromatic ester diphenol, a preparation method and a preparation method of a mesomorphic epoxy monomer. The side substitution aromatic ester diphenol has a general formula shown in the specification of the invention, wherein X stands for an aryl group with side substitution. In the preparation method of an aromatic ester mesomorphic epoxy monomer by using the side substitution aromatic ester diphenol, a synthetic period of the monomer is greatly shortened, the raw materials of the synthetic monomer are cheap and are easy to obtain, and the preparation method is simple and convenient.

The present invention relates to a process for efficiently producing an optically active 2-bromocarboylic acid and an optically active 2-sulfonyloxycarboxylic acid, which are important in the production of medicinal compounds and so forth. An optically active 2-sulfonyloxycarboxylic acid ester is subjected to deprotection under acid conditions to obtain an optically active 2-sulfonyloxycarboxylic acid. A metal bromide is caused to act on the acid to brominate it with configuration inversion at position 2 to thereby produce an optically active 2-bromocarboxylic acid. The resultant optically active 2-bromocarboxylic acid is isolated/purified by subjecting it to a step in which the acid is crystallized and separated as a salt with a base. Thus, an optically active 2-bromocarboxylic acid having a high chemical purity and high optical purity can be produced.

An amorphous carbon having sulfonate group introduced therein is provided which is characterized in that chemical shifts of a condensed aromatic carbon 6-membered ring and a condensed aromatic carbon 6-membered ring having sulfonate group bonded thereto are detected in a ¹³C nuclear magnetic resonance spectrum and that at least a diffraction peak of carbon (002) face whose half-value width (2θ) is in the range of 5 to 30° is detected in powder X-ray diffractometry, and which exhibits proton conductivity. This sulfonated amorphous carbon is very useful as a proton conductor material or solid acid catalyst because it excels in proton conductivity, acid catalytic activity, thermal stability and chemical stability and can be produced at low cost.

A method is disclosed for the production of taurine in high yield by a cyclic process of reacting monoethanolamine, sulfuric acid, and ammonium sulfite in the presence of additives to inhibit the hydrolysis of 2-aminoethyl hydrogen sulfate intermediate. The cyclic process is economical and little waste is generated.

Hydrocarbon liquids and olefins can be made from methane with greater efficiency than previously available, by converting methane into methanesulfonic acid (MSA), then converting the MSA into a reactive anhydride called sulfene, H₂C═SO₂. Sulfene will exothermically form ethylene, an olefin. It also can insert methylene groups (—CH₂—) into hydrocarbon liquids, to make heavier and more valuable liquids. Other options are disclosed for improved methods of making MSA (such as by using di(methyl-sulfonyl) peroxide as a radical initiator), for converting MSA into products such as dimethyl ether (DME), and for using DME as a “peak shaving” gas that can be injected into natural gas supply pipelines with no disruptions to end-use burners.

The invention discloses a 3-cyclohexyl-1,1-dimethylurea compound as well as a preparation method and application thereof. The 3-cyclohexyl-1,1-dimethylurea compound is used for preparing an antischizophrenic drug cariprazine. Compared with the prior art and report literatures, the preparation method of the 3-cyclohexyl-1,1-dimethylurea compound has the remarkable advantages of being free of removal of protecting groups such as Boc group, high in atom economy, low in cost and easy in getting of raw materials, mild in reaction condition, stable in yield, simple and convenient to operate, controllable in product quality, high in product purity, less in three waste pollution and easy to produce industrially. The structure formula of the 3-cyclohexyl-1,1-dimethylurea compound is as shown in (I) in the specification.

The invention discloses a novel ester group-containing aromatic propionamide compound as well as a preparation method and an application thereof, and provides a chemical structure formula of the novel ester group-containing aromatic propionamide compound. The compound is prepared by taking an acyl chloride compound and proline as starting raw materials. The compound has the effect of adjusting an androgen receptor and can be independently used or being used as a composition to be used for treating and/or preventing various diseases related to androgens, such as diseases of male androgen deficiency (ADAM), diseases of female androgen deficiency (ADIF), muscle consumption, muscle emaciation, amyotrophy, osteoporosis, sclerotin reduction, anemia, obesity, diabetes mellitus, cancers and the like; the compound can also be used for an exercise and/or body function enhancing agent or an animal feed additive.