Aspartyldipeptideamine derivatives and sweetner
    91.
    发明授权
    Aspartyldipeptideamine derivatives and sweetner 失效
    天冬氨酰二酰胺衍生物和甜味剂

    公开(公告)号:US5795612A

    公开(公告)日:1998-08-18

    申请号:US579976

    申请日:1995-12-28

    CPC分类号: C07K5/06113

    摘要: Novel aspartyldipeptideamide derivatives of formula (I): L--Asp--X--NH--C*HR.sub.1 R.sub.2 and salts thereof, wherein X is a D-.alpha.-amino acid residue or a DL-.alpha.-amino acid residue selected from the group consisting of D-alanine, D-.alpha.-aminobutyric acid, D-norvaline, D-valine, D-norleucine, D-leucine, D-isoleucine, D-alloisoleucine, D-t-leucine, D-serine, D-O-methylserine, D-threonine, D-O-methylthreonine, D-allothreonine, D-O-methylallothreonine, D-phenyl glycine and D- or DL furyl glycine, or X is a cyclic or non-cyclic .alpha., .alpha.-dialkyl amino acid residue having 3 to 6 carbon atoms; R.sub.1 is a linear or branched alkyl group having 1 to 6 carbon atoms or an alkoxymethyl group having 2 to 7 carbon atoms in the alkoxy portion; R.sub.2 is a phenyl group having a substituent in its 2, 3- or 4-position selected from the group consisting of F, Cl, Br, I, a hydroxy group, a linear or branched alkoxy group having 1 to 6 carbon atoms, a cyano group, a nitro group, an acetyl group, an amino group and an acetylamino group, or R.sub.2 is a phenyl group having a methylenedioxy group, a trimethylene group or a tetramethylene group in its 2, 3- or 3, 4- position or R.sub.2 is a 2, 3- or 4-pyridyl group, a 2- or 3-furyl group or a 2- or 3-thienyl group; the configuration of C* in formula (I) is (S) or (RS) when R.sub.1 is a linear or branched alkyl group; (R), (S), or (RS) when R.sub.1 is an alkoxymethyl group; and in formula (I), L-Asp and X are .alpha.-bonded.

    摘要翻译: 式(I)的新型天冬氨酰二肽酰胺衍生物:L-Asp-X-NH-C * HR1R2及其盐,其中X为D-氨基酸残基或DL-α-氨基酸残基,其选自 D-丙氨酸,D-α-氨基丁酸,D-正缬氨酸,D-缬氨酸,D-正亮氨酸,D-亮氨酸,D-异亮氨酸,D-异亮氨酸,D-L-亮氨酸,D-丝氨酸,DO-甲基丝氨酸,D-苏氨酸 ,D-甲基苏氨酸,D-异亮氨酸,DO-甲基缩氨基丁酸,D-苯基甘氨酸和D-或DL呋喃基甘氨酸,或X是具有3至6个碳原子的环状或非环状α,α-二烷基氨基酸残基; R1是烷氧基部分中具有1至6个碳原子的直链或支链烷基或具有2至7个碳原子的烷氧基甲基; R2是在其选自F,Cl,Br,I,羟基,具有1至6个碳原子的直链或支链烷氧基的2,3或4位中具有取代基的苯基, 氰基,硝基,乙酰基,氨基和乙酰氨基,或者R2是在其3-或4-或3-位上具有亚甲二氧基,三亚甲基或四亚甲基的苯基, R2是2,3-或4-吡啶基,2-或3-呋喃基或2-或3-噻吩基; 当R 1为直链或支链烷基时,式(I)中C *的构型为(S)或(RS) (R),(S)或(RS); 在式(I)中,L-Asp和X是α键。

    Method for recovering L-phenylalanine
    92.
    发明授权
    Method for recovering L-phenylalanine 失效
    L-苯丙氨酸的回收方法

    公开(公告)号:US5616766A

    公开(公告)日:1997-04-01

    申请号:US441737

    申请日:1995-05-16

    摘要: The present invention provides crystals of L-phenylalanine monomethyl sulfate which have low solubility compared to L-tyrosine and D-phenylalanine. The L-phenylalanine monomethylsulfate crystals are obtained by subjecting a solution containing monomethyl sulfuric acid and phenylalanine to crystallization.Further, the present invention also provides a process for recovering L-phenylalanine from a water layer by neutralizing the esterified reaction, extracting an ester of L-phenylalanine therefrom with an organic solvent, and recovering remaining L-phenylalanine in the water layer as L-phenylalanine monomethylsulfate. L-phenylalanine monomethyl sulfate is obtained by esterifying L-phenylalanine and methanol in the presence of sulfuric acid, neutralizing the esterified solution with a base in the presence of water, extracting the produced L-phenylalanine methyl ester from the neutralized solution with an organic solvent, and then crystallized the resultant water layer under acidic condition.

    摘要翻译: 本发明提供了与L-酪氨酸和D-苯丙氨酸相比具有低溶解度的L-苯丙氨酸单甲硫酸盐晶体。 通过使含有单硫酸和苯丙氨酸的溶液结晶来获得L-苯丙氨酸单甲基硫酸盐晶体。 此外,本发明还提供了通过中和酯化反应从水层中回收L-苯丙氨酸的方法,用有机溶剂从其中提取L-苯丙氨酸的酯,并将水层中剩余的L-苯丙氨酸回收为L- 苯丙氨酸单甲基硫酸盐。 通过在硫酸存在下酯化L-苯丙氨酸和甲醇获得L-苯丙氨酸单甲硫酸盐,在水存在下用碱中和酯化溶液,用有机溶剂从中和溶液中萃取生成的L-苯丙氨酸甲酯 ,然后在酸性条件下使所得水层结晶。

    Method for recovering L-phenylalanine
    94.
    发明授权
    Method for recovering L-phenylalanine 失效
    L-苯丙氨酸的回收方法

    公开(公告)号:US5466864A

    公开(公告)日:1995-11-14

    申请号:US190450

    申请日:1994-02-02

    摘要: The present invention provides crystals of L-phenylalanine monomethyl sulfate which have low solubility compared to L-tyrosine and D-phenylalanine. The L-phenylalanine monomethylsulfate crystals are obtained by subjecting a solution containing monomethyl sulfuric acid and phenylalanine to crystallization.Further, the present invention also provides a process for recovering L-phenylalanine from a water layer by neutralizing the esterified reaction, extracting an ester of L-phenylalanine therefrom with an organic solvent, and recovering remaining L-phenylalanine in the water layer as L-phenylalanine monomethylsulfate. L-phenylalanine monomethyl sulfate is obtained by esterifying L-phenylalanine and methanol in the presence of sulfuric acid, neutralizing the esterified solution with a base in the presence of water, extracting the produced L-phenylalanine methyl ester from the neutralized solution with an organic solvent, and then crystallized the resultant water layer under acidic condition.

    摘要翻译: 本发明提供了与L-酪氨酸和D-苯丙氨酸相比具有低溶解度的L-苯丙氨酸单甲硫酸盐晶体。 通过使含有单硫酸和苯丙氨酸的溶液结晶来获得L-苯丙氨酸单甲基硫酸盐晶体。 此外,本发明还提供了通过中和酯化反应从水层中回收L-苯丙氨酸的方法,用有机溶剂从其中提取L-苯丙氨酸的酯,并将水层中剩余的L-苯丙氨酸回收为L- 苯丙氨酸单甲基硫酸盐。 通过在硫酸存在下酯化L-苯丙氨酸和甲醇获得L-苯丙氨酸单甲硫酸盐,在水存在下用碱中和酯化溶液,用有机溶剂从中和溶液中萃取生成的L-苯丙氨酸甲酯 ,然后在酸性条件下使所得水层结晶。

    Method for preparing amino acid esters
    96.
    发明授权
    Method for preparing amino acid esters 失效
    制备氨基酸酯的方法

    公开(公告)号:US5424476A

    公开(公告)日:1995-06-13

    申请号:US194635

    申请日:1994-02-10

    CPC分类号: C07C227/18

    摘要: A method for preparing an amino acid ester with sulfuric acid as the catalyst in high yield, in which a mixture of amino acid, sulfuric acid and an alcohol is heated while adding the alcohol as a liquid or gas to the reaction mixture and alcohol from the reaction mixture is distilled off.

    摘要翻译: 以高产率制备硫酸作为催化剂的氨基酸酯的方法,其中将氨基酸,硫酸和醇的混合物加热,同时将醇作为液体或气体加入到反应混合物中,并将醇从 蒸馏出反应混合物。

    Method for conversion of .beta.-aspartylphenylalanine derivatives to .alpha
.
    98.
    发明授权
    Method for conversion of .beta.-aspartylphenylalanine derivatives to .alpha . 失效
    将β-天冬氨酰苯丙氨酸衍生物转化为α-天冬氨酰苯丙氨酸衍生物的方法

    公开(公告)号:US4673744A

    公开(公告)日:1987-06-16

    申请号:US857978

    申请日:1986-05-01

    CPC分类号: C07D241/08

    摘要: A method for converting .beta.-aspartylphenylalanine derivative (1) to .alpha.-aspartylphenylalanine derivatives (2) and (3), said derivatives having the following structures: ##STR1## which comprises: reacting said .beta.-aspartylphenylalanine derivative (1) at a temperature of from 0.degree. to 200.degree. C. for a time period of from 30 minutes to 80 hours, in a C.sub.1 to C.sub.4 alcohol solvent with or without stirring, wherein R and R' represent hydrogen or an alkyl group having from 1 to 4 carbon atoms.

    摘要翻译: 将β-天冬氨酰苯基丙氨酸衍生物(1)转化为α-天冬氨酰苯丙氨酸衍生物(2)和(3)的方法,所述衍生物具有以下结构:其中包括:反应 所述β-天冬氨酰苯基丙氨酸衍生物(1)在0〜200℃的温度下进行30分钟〜80小时的时间,在C1〜C4醇溶剂中搅拌或不搅拌,其中R和R'表示 氢或具有1至4个碳原子的烷基。