Process for producing a furan derivative
    3.
    发明授权
    Process for producing a furan derivative 失效
    呋喃衍生物的制造方法

    公开(公告)号:US4154744A

    公开(公告)日:1979-05-15

    申请号:US840128

    申请日:1977-10-07

    IPC分类号: C07D307/46 C07D307/50

    CPC分类号: C07D307/50 C07D307/46

    摘要: A process for producing furan derivatives of the formula, ##STR1## wherein R is hydrogen, methyl or chloromethyl, which comprises reacting a mono- or a disaccharide with hydrochloric acid in a mixture containing water, an organic solvent and a catalytic amount of a surface active agent.

    摘要翻译: 一种制备下式的呋喃衍生物的方法,其中R是氢,甲基或氯甲基,其包括使单糖或二糖与盐酸在含有水,有机溶剂和催化量的表面的混合物中反应 活性剂。

    Racemization of optically active amines
    4.
    发明授权
    Racemization of optically active amines 失效
    光学活性胺的外消旋化

    公开(公告)号:US3970700A

    公开(公告)日:1976-07-20

    申请号:US503691

    申请日:1974-09-06

    IPC分类号: B01J23/04 C07C85/26

    摘要: A method for racemization of optically active amines which comprises contacting an optically active amine of the formula: ##EQU1## wherein C* is an asymmetric carbon atom, R.sub.1 is alkyl, aralkyl or aryl and R.sub.2 is aryl or alkoxycarbonyl, the aryl or aralkyl moiety bearing optionally one or more alkyl or alkoxy groups on the aromatic ring, provided that R.sub.1 and R.sub.2 are always different from each other, with an alkali metal catalyst selected from the group consisting of (1) an alkali metal deposited on a solid carrier, (2) an alkali metal dispersed in a liquid medium and (3) an alkali metal alloy at a temperature of from -10.degree. to 50.degree.C until a sufficient amount of the optically active amine is recemized.

    摘要翻译: 一种光学活性胺外消旋化的方法,其包括使下式的光学活性胺与式R 1 -C 6 H-R 2 | NH 2接触,其中C *是不对称碳原子,R 1是烷基,芳烷基或芳基,R 2是芳基或烷氧基羰基 R 1和R 2总是彼此不同,芳基或芳烷基部分任选地在芳环上具有一个或多个烷基或烷氧基,碱金属催化剂选自(1)碱金属沉积物 在固体载体上,(2)分散在液体介质中的碱金属和(3)在-10℃至50℃的温度下的碱金属合金,直到接收到足够量的光学活性胺。

    Method for racemization of optically active amines
    5.
    发明授权
    Method for racemization of optically active amines 失效
    光学活性胺外消旋化的方法

    公开(公告)号:US4246424A

    公开(公告)日:1981-01-20

    申请号:US686575

    申请日:1976-05-14

    CPC分类号: C07B55/00

    摘要: A method for racemization of optically active amines which comprises contacting an optically active amine of the formula: ##STR1## wherein C* is an asymmetric carbon atom, R.sub.1 is alkyl, aralkyl or aryl and R.sub.2 is aryl or alkoxycarbonyl, the aryl or aralkyl moiety bearing optionally one or more alkyl or alkoxy groups on the aromatic ring, provided that R.sub.1 and R.sub.2 are always different from each other, with a catalyst comprising an alkali metal and a polycyclic aromatic hydrocarbon until a sufficient amount of the optically active amine is racemized.

    摘要翻译: 一种光学活性胺外消旋化的方法,其包括使下式的光学活性胺:其中C *是不对称碳原子,R 1是烷基,芳烷基或芳基,R 2是芳基或烷氧基羰基,芳基或芳烷基部分 如果R 1和R 2总是彼此不同,则在芳环上任选地具有一个或多个烷基或烷氧基,直到足够量的光学活性胺被外消旋化为止包含碱金属和多环芳烃的催化剂。

    Racemization of optically active
2,2-dimethyl-3-(1'-alkenyl)-cyclopropane-1-carboxylic acids
    6.
    发明授权
    Racemization of optically active 2,2-dimethyl-3-(1'-alkenyl)-cyclopropane-1-carboxylic acids 失效
    光学活性的2,2-二甲基-3-(1 {40-烯基) - 环丙烷-1-羧酸的外消旋化

    公开(公告)号:US3989750A

    公开(公告)日:1976-11-02

    申请号:US522130

    申请日:1974-11-08

    CPC分类号: C07C51/487

    摘要: A method for racemization of optically active 2,2-dimethyl-3-(1'-alkenyl)-cyclopropane-1-carboxylic acids of the formula: ##EQU1## wherein R.sub.1 and R.sub.2 are each a hydrogen atom or an alkyl group having 1 to 4 carbon atoms or, when taken together with the carbon atom to which they are attached, represent a cycloalkylidene group having 4 to 6 carbon atoms, which comprises the step of contacting the corresponding acid halide with a Lewis acid.

    摘要翻译: 用于下式的光学活性2,2-二甲基-3-(1'-链烯基) - 环丙烷-1-羧酸外消旋化的方法:CH 3 CH 3 ANGLE C ANGLE 2 R1 31 ANGLE C = CH-CH ---- CH -COOH ** R2其中R 1和R 2各自为氢原子或具有1至4个碳原子的烷基,或者当与它们所连接的碳原子一起表示碳原子数为4〜6的亚环烷基时, 其包括使相应的酰卤与路易斯酸接触的步骤。

    Racemization of optically active
2,2-dimethyl-3-(1'-alkenyl)-cyclopropane-1-carboxylic acids
    7.
    发明授权
    Racemization of optically active 2,2-dimethyl-3-(1'-alkenyl)-cyclopropane-1-carboxylic acids 失效
    光学活性的2,2-二甲基-3-(1'-烯基) - 环丙烷-1-羧酸的外消旋化

    公开(公告)号:US4182906A

    公开(公告)日:1980-01-08

    申请号:US798473

    申请日:1977-05-19

    CPC分类号: C07C51/487

    摘要: A method for racemization of optically active 2,2-dimethyl-3-(1'-alkenyl)-cyclopropane-1-carboxylic acids of the formula: ##STR1## wherein R.sub.1 and R.sub.2 are each a hydrogen atom or an alkyl group having 1 to 4 carbon atoms or, when taken together with the carbon atom to which they are attached, represent a cycloalkylidene group having 4 to 6 carbon atoms, which comprises the step of contacting the corresponding acid halide with boron halide at a temperature of not more than 20.degree. C.

    摘要翻译: 一种下式的光学活性2,2-二甲基-3-(1'-链烯基) - 环丙烷-1-羧酸的外消旋化方法:其中R 1和R 2各自为氢原子或具有1个 至4个碳原子,或者当与它们所连接的碳原子一起表示碳原子数为4〜6的亚环烷基时,其包括使相应的酰卤与卤化硼在不大于 20℃

    Method for racemization of optically active amines
    8.
    发明授权
    Method for racemization of optically active amines 失效
    光学活性胺外消旋化的方法

    公开(公告)号:US4158016A

    公开(公告)日:1979-06-12

    申请号:US861515

    申请日:1977-12-16

    IPC分类号: C07B55/00 C07C85/26

    CPC分类号: C07B55/00

    摘要: A method for racemization of optically active amines which comprises contacting an optically active amine of the formula: ##STR1## wherein C* is an asymmetric carbon atom, R.sub.1 is alkyl, aralkyl or aryl and R.sub.2 is aryl or alkoxycarbonyl, the aryl or aralkyl moiety bearing optionally one or more alkyl or alkoxy groups on the aromatic ring, provided that R.sub.1 and R.sub.2 are always different from each other, with a catalyst comprising an alkali metal and a polycyclic aromatic hydrocarbon until a sufficient amount of the optically active amine is racemized.

    摘要翻译: 一种光学活性胺外消旋化的方法,其包括使下式的光学活性胺:其中C *是不对称碳原子,R 1是烷基,芳烷基或芳基,R 2是芳基或烷氧基羰基,芳基或芳烷基部分 如果R 1和R 2总是彼此不同,则在芳环上任选地具有一个或多个烷基或烷氧基,直到足够量的光学活性胺被外消旋化为止包含碱金属和多环芳烃的催化剂。

    Process for producing 2-(2'-methyl-1'-propenyl)-4-methyltetrahydropyran
    9.
    发明授权
    Process for producing 2-(2'-methyl-1'-propenyl)-4-methyltetrahydropyran 失效
    2-(2'-甲基-1'-丙烯基)-4-甲基四氢吡喃的制备方法

    公开(公告)号:US4312717A

    公开(公告)日:1982-01-26

    申请号:US158810

    申请日:1980-06-12

    摘要: Rose oxide, which is an important olfactive compound valuable in the art of perfumery, is advantageously produced from citronellol through a novel synthetic route comprising(1) anodic alkoxylation of citronellol using as a supporting electrolyte an alkali metal aromatic sulfonate,(2) dealkoxylation of the resulting 2,6-dimethyl-3-alkoxyoct-1-en-8-ol in the presence of a palladium or nickel complex, and then(3) cyclization of the resulting dehydrocitronellol in the presence of an acid.

    摘要翻译: 玫瑰氧化物是香料技术中有价值的重要的嗅觉化合物,有利地由香茅醇通过新的合成路线制备,其包括(1)使用碱金属芳族磺酸盐作为支持电解质的香茅醇的阳极烷氧基化,(2) 所得的2,6-二甲基-3-烷氧基辛-1-烯-8-醇在钯或镍络合物的存在下,然后(3)在酸的存在下环化所得的脱氢天ron醇。

    Optically active imidazolidin-2-one derivatives
    10.
    发明授权
    Optically active imidazolidin-2-one derivatives 失效
    光学活性的咪唑烷-2-酮衍生物

    公开(公告)号:US4403096A

    公开(公告)日:1983-09-06

    申请号:US278350

    申请日:1981-06-29

    CPC分类号: C07D491/04 C07D233/32

    摘要: A novel optically active cis-4,5-disubstituted imidazolidin-2-one derivative of the formula: ##STR1## wherein R.sup.1 is a C.sub.1 -C.sub.4 alkyl group or benzyl and R.sup.2 is a chiral aralkyl group optionally having at least one of C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 alkoxy and hydroxyl groups is produced asymmetrically by the reaction of 1,3-dibenzyl-cis-4,5-dicarboxy-imidazolidin-2-one or its anhydride with an optically active secondary amine of the formula: ##STR2## wherein R.sup.1 and R.sup.2 are each as defined above and is transformed into the lactone of 1,3-dibenzyl-cis-4-carboxy-5-hydroxymethyl-imidazolidin-2-one, which is a key intermediate in the synthesis of d-biotin.

    摘要翻译: 一种新型的光学活性的顺式-4,5-二取代的咪唑烷-2-酮衍生物,其结构式如下:其中R 1是C 1 -C 4烷基或苄基,R 2是任选具有至少一个C 1 -C 4烷基的手性芳烷基, C4烷基,C1-C4烷氧基和羟基通过1,3-二苄基 - 顺-4,5-二羧基 - 咪唑烷-2-酮或其酸酐与下式的光学活性仲胺的反应不对称地制备: 其中R1和R2各自如上所定义,并转化为1,3-二苄基 - 顺式-4-羧基-5-羟甲基 - 咪唑烷-2-酮的内酯,其是合成d中的关键中间体 生物素