摘要:
The invention relates to a novel process for producing the threo- and erythro-isomers of 1-phenyl-2-nitro-1,3-propanediol through the aldol-type alkaline condensation of benzaldehyde and nitroethanol, wherein the reaction mixture is acidified and, if desired, the isomers are separated from the obtained isomer mixture and the obtained isomers are transformed into each other through epimerization, characterized in that the condensation and, if desired, also the epimerization are carried out in the presence of catalytical amounts of an alkaline hydroxide.The process according to the invention makes it possible to produce 1-phenyl-2-nitro-1,3-propanediol, an intermediate of the antibiotic chloramphenicol, in high yields, and in an extremely advantageous way which can be carried out simply and economically even on an industrial scale.
摘要:
The present invention relates to a process for producing optically active β-nitroalcohols wherein nitroaldol reactions of aldehydes and nitroalkanes are carried out in the presence of a base and an optically active metal complex catalyst represented by the following formula (c): (where R4, R5, and R6 represent a hydrogen atom, an alkyl group, an alkenyl group, an aryl group, an acyl group, an alkoxycarbonyl group, or an aryloxycarbonyl group, and R5 and R6 may be linked together to form a ring; X* represents a hydrocarbon group having an asymmetric carbon atom or axial asymmetry; M represents a cobalt ion or a chromium ion; and Y represents an anion capable of forming a salt when the valence of M is larger than that of a ligand).
摘要翻译:本发明涉及一种制备光学活性β-硝基醇的方法,其中醛和硝基烷烃的硝基醛反应在碱存在下进行,和由下式(c)表示的光学活性金属络合物催化剂进行:(其中R' O 4,R 5,R 6和R 6表示氢原子,烷基,烯基,芳基,酰基, 烷氧基羰基或芳氧基羰基,R 5和R 6可以连接在一起形成环; X *表示具有不对称碳原子或轴向的烃基 不对称; M表示钴离子或铬离子; Y表示当M的化合价大于配体的价数时能形成盐的阴离子)。
摘要:
The present invention relates to compounds of the general formula: NO2-A-B wherein A is a saturated or unsaturated hydrocarbon chain of 14-26 carbon atoms and B is (CH2)n(COOH)m in which n is an integer from 0 to 2 and m is an integer from 0 to 2; or of general formula (I), wherein A′ is a saturated or unsaturated hydrocarbon chain of 9-26 carbon atoms, X is oxygen or is absent and B′ is (CH2)j(COOH)k in which j is an integer from 1 to 3 and k is 0 or 1; and the derivatives thereof in which the hydrocarbon chain includes one or more than one substitution selected from the group consisting of hydroxy, hydroperoxy, epoxy and peroxy. These compounds have biological activity, e.g. as anti-infective or anti-inflammatory agents.
摘要:
Selective and efficient multifunctional nanoporous catalysts containing spatially distributed organoamine and silanol groups, and methods of preparation thereof. The catalysts have been observed to be very highly efficient in catalysis of the Henry reaction.
摘要:
The present invention relates to a process for producing optically active β-nitroalcohols wherein nitroaldol reactions of aldehydes and nitroalkanes are carried out in the presence of a base and an optically active metal complex catalyst represented by the following formula (c): (where R4, R5, and R6 represent a hydrogen atom, an alkyl group, an alkenyl group, an aryl group, an acyl group, an alkoxycarbonyl group, or an aryloxycarbonyl group, and R5 and R6 may be linked together to form a ring; X* represents a hydrocarbon group having an asymmetric carbon atom or axial asymmetry; M represents a cobalt ion or a chromium ion; and Y represents an anion capable of forming a salt when the valence of M is larger than that of a ligand).
摘要翻译:本发明涉及一种制备光学活性β-硝基醇的方法,其中醛和硝基烷烃的硝基醛反应在碱存在下进行,和由下式(c)表示的光学活性金属络合物催化剂进行:(其中R' O 4,R 5,R 6和R 6表示氢原子,烷基,烯基,芳基,酰基, 烷氧基羰基或芳氧基羰基,R 5和R 6可以连接在一起以形成环; X *表示烃基 具有不对称碳原子或轴向不对称; M表示钴离子或铬离子; Y表示当M的化合价大于配体的化合价时能形成盐的阴离子)。
摘要:
The present invention relates to compounds of the general formula: NO2-A-B wherein A is a saturated or unsaturated hydrocarbon chain of 14-26 carbon atoms and B is (CH2)n(COOH)m in which n is an integer from 0 to 2 and m is an integer from 0 to 2; or of general formula (I), wherein A′ is a saturated or unsaturated hydrocarbon chain of 9-26 carbon atoms, X is oxygen or is absent and B′ is (CH2)j(COOH)k in which j is an integer from 1 to 3 and k is 0 or 1; and the derivatives thereof in which the hydrocarbon chain includes one or more than one substitution selected from the group consisting of hydroxy, hydroperoxy, epoxy and peroxy. These compounds have biological activity, e.g. as anti-infective or anti-inflammatory agents.
摘要:
The present invention provides novel stabilized crosslinked compounds having secondary structure motifs, libraries of these novel compounds, and methods for the synthesis of these compounds libraries thereof. The synthesis of these novel stabilized compounds involves (1) synthesizing a peptide from a selected number of natural or non-natural amino acids, wherein said peptide comprises at least two moieties capable of undergoing reaction to promote carbon-carbon bond formation; and (2) contacting said peptide with a reagent to generate at least one crosslinker and to effect stabilization of a secondary structure motif. The present invention, in a preferred embodiment, provides stabilized p53 donor helical peptides. Additionally, the present invention provides methods for disrupting the p53/MDM2 binding interaction comprising (1) providing a crosslinked stabilized α-helical structure; and (2) contacting said crosslinked stabilized α-helical structure with MDM2.
摘要:
The present invention relates to pharmaceutical compositions comprising, as an anticancer agent: (a) one or more compounds having the formula NO2-A-B, wherein A is a saturated or unsaturated hydrocarbon chain of 14-26 double bonds, and B is (CH2)m(COOH)n in which n is an integer from 0 to 2 and m is an integer from 0 to 2; or a derivative thereof in which the hydrocarbon chain has one or more than one substitution selected from the group consisting of hydroxy, hydroperoxy, epoxy and peroxy; (b) one or more compounds selected from polyunsaturated fatty acids (PUFA's) having a 16 to 26 carbon atom chain and 3 to 6 double bonds, and wherein the PUFA is covalently coupled at the carboxylic acid group to an amino acid selected from glycine and aspartic acid; (c) one or more compounds selected from unsaturated fatty acids having an 18 to 25 carbon atom chain and 1 to 6 double bonds and wherein the fatty acid has one or two β-oxa, γ-oxa, β-thia, γ-thia substitutions; or (d) one or more compounds having formula (I) wherein A′ is a saturated or unsaturated hydrocarbon chain of 9-26 carbon atoms, X is oxygen or is absent and B′ is (CH2)j(COOH)k in which j is an integer from 1 to 3 and k is 0 or 1; or a derivative thereof in which the hydrocarbon chain has one or more than one substitution selected from the group consisting of hydroxy, hydroperoxy, epoxy and peroxy; and a pharmaceutically acceptable carrier or diluent.