会员体验
专利管家(专利管理)
工作空间(专利管理)
风险监控(情报监控)
数据分析(专利分析)
侵权分析(诉讼无效)
联系我们
交流群
官方交流:
QQ群: 891211   
微信请扫码    >>>
现在联系顾问~
热词
    • 7. 发明授权
    • Epimerization of sugars, in particular of D-arabinose to D-ribose
    • 糖异构化,特别是D-阿拉伯糖对D-核糖
    • US4778531A
    • 1988-10-18
    • US68171
    • 1987-06-30
    • Walter DoblerHansgeorg ErnstJoachim Paust
    • Walter DoblerHansgeorg ErnstJoachim Paust
    • C07B61/00C07H3/00C07H3/02C07H1/00C13J1/06
    • C07H3/02
    • Pentoses and hexoses are epimerized by heating sugar dissolved in a solvent in the presence of a molybdenum(VI) compound, by an improved process in which, for the preparation of a sugar having cis OH groups in the 2- or 3-position, of the formula Ia or Ib ##STR1## where R is one of the radicals ##STR2## a homogeneous solution of the corresponding sugar of the formula IIa or IIb ##STR3## is heated to 75.degree.-100.degree. C. in the presence of from 30 to 200 mol %, based on sugar used, of a metal salt of the formula (III)MeX.sub.2 (III)where Me is Mg, Ca, Sr, Ba or Zn and X is Cl or Br, which may or may not contain water of crystallization, and in the presence of from 2 to 20 mol %, based on the sugar used, of a molybdenum(VI) compound.The process is particularly important for the preparation of D-ribose, which is required as an intermediate for vitamin B.sub.2.
    • 戊糖和己糖通过加热溶解在钼(VI)化合物存在下的溶剂中的糖进行差向异构化,其中通过改进方法,其中为了制备在2-或3-位具有顺式OH基团的糖, 式Ia或Ib的化合物,其中R是式IIa或IIb的相应糖的均匀溶液之一的基团之一,在30℃的存在下加热至75℃-100℃ (III)的MeX2(III)的金属盐,其中Me是Mg,Ca,Sr,Ba或Zn,X是Cl或Br,其可以含有或可以不含水 的结晶,并且在基于所用糖的2至20摩尔%的存在下,使用钼(VI)化合物。 该方法对于制备作为维生素B2的中间体的D-核糖是特别重要的。
    • 8. 发明授权
    • Preparation of .alpha.-tocopherol
    • α-生育酚的制备
    • US4550182A
    • 1985-10-29
    • US588374
    • 1984-03-12
    • Hansgeorg ErnstHenning-Peter GehrkenJoachim Paust
    • Hansgeorg ErnstHenning-Peter GehrkenJoachim Paust
    • C07D317/60B01J31/16C07B61/00C07D311/72
    • C07D311/72
    • A process for the preparation of .alpha.-tocopherol of the formula I ##STR1## by reacting a chroman derivative with a C.sub.14 -Grignard reagent using a di-alkali metal tetrahalocuprate catalyst in a Schlosser-Fouquet reaction, wherein a chroman derivative of the general formula II ##STR2## where Y is a leaving group, especially Br, is used and is reacted, at from -70.degree. to 0.degree. C., first with a solution of about 1 equivalent of a Grignard compound of the general formula IIIX--Mg--R (III)where X is Cl, Br or I and R is straight-chain or branched alkyl of 1 to 14 carbon atoms, preferably methyl, ethyl or ##STR3## and then with a solution of a Grignard reagent of the formula IIIa ##STR4## in an ether solvent and a solution of a di-alkali metal tetrahalocuprate in an ether solvent. The novel process simplifies the preparation of 2RS,4'RS,8'RS-, 2R,4'RS,8'RS- or 2R,4'R,8'R-.alpha.-tocopherol by reacting a chroman structural unit, containing a C.sub.2 side-chain in the 2-position, with the corresponding C.sub.14 -Grignard compound.
    • 通过在Schlosser-Fouquet反应中使用二碱金属四卤代硼酸催化剂使苯并二氢吡喃衍生物与C14-格氏试剂反应制备式I的α-生育酚的方法,其中将 使用其中Y为离去基团,特别是Br的通式II(II),并且在-70℃至0℃下反应,首先用约1当量的Grignard化合物 通式III X-Mg-R(III)其中X为Cl,Br或I,R为1至14个碳原子的直链或支链烷基,优选为甲基,乙基或者“ 式IIIa的格利雅试剂(IIIa)在醚溶剂中和二碱金属四卤代硼酸酯在醚溶剂中的溶液。 该新方法简化了2RS,4'RS,8'RS-,2R,4'RS,8'RS-或2R,4'R,8'R-α-生育酚的制备,通过使色结构单元反应, 2-位的C2侧链与相应的C14-格利雅化合物。
    • 9. 发明授权
    • Preparation of riboflavin
    • 核黄素的制备
    • US4567261A
    • 1986-01-28
    • US570457
    • 1984-01-13
    • Hansgeorg ErnstWolfram SchmidtJoachim Paust
    • Hansgeorg ErnstWolfram SchmidtJoachim Paust
    • C07D475/14C07D475/02
    • C07D475/02
    • Riboflavin of the formula I ##STR1## is prepared by condensing a 4,5-dimethyl-N-(D)-ribityl-2-phenylazoaniline of the formula II ##STR2## where R is H or --Cl, --NO.sub.2 or --CH.sub.3 in the o- or p-position, with barbituric acid of the formula III ##STR3## in the presence of an acid as the condensing agent, by an improved process in which the acidic condensing agent used is an aliphatic or cycloaliphatic/aliphatic tertiary carboxylic acid of the general formula IV ##STR4## where R.sup.1, R.sup.2 and R.sup.3 are each a lower alkyl group, R.sup.1, R.sup.2 and R.sup.3 together containing 3 to 20, preferably 3 to 10, carbon atoms, or R.sup.1 is a lower alkyl group, in particular methyl, and R.sup.2 and R.sup.3 together form a tetramethylene or pentamethylene group.The process can be particularly advantageously carried out using trimethylacetic acid or a commercial mixture of saturated tertiary carboxylic acids, e.g. Versatic .sup.R 10-acid.
    • 式I(I)的核黄素通过将式II的4,5-二甲基-N-(D) - 二乙基苯基偶氮苯胺(II)缩合制备,其中R是H或-Cl ,在邻位或对位的-NO 2或-CH 3与通式III的巴比妥酸(III)在作为缩合剂的酸存在下,通过改进的方法,其中使用酸性缩合剂 是通式IV(IV)的脂族或脂环族/脂肪族三羧酸,其中R 1,R 2和R 3各自为低级烷基,R 1,R 2和R 3一起含有3至20,优选3至10, 碳原子,或R 1是低级烷基,特别是甲基,R 2和R 3一起形成四亚甲基或五亚甲基。 该方法可以特别有利地使用三甲基乙酸或饱和叔羧酸的商业混合物,例如, 通用R10酸。