Preparation of alkylesters of
0,0-dialkyl-4-phosphono-2-methyl-2-butenoic acid and alkyl esters of
4-halo-2-methyl-2-butenoic acid containing a high percentage of E
isomers
    11.
    发明授权
    Preparation of alkylesters of 0,0-dialkyl-4-phosphono-2-methyl-2-butenoic acid and alkyl esters of 4-halo-2-methyl-2-butenoic acid containing a high percentage of E isomers 失效
    制备0-0-二烷基-4-膦酰基-2-甲基-2-丁烯酸的烷基酯和含有高百分比的E异构体的4-卤代-2-甲基-2-丁烯酸的烷基酯

    公开(公告)号:US5717128A

    公开(公告)日:1998-02-10

    申请号:US535637

    申请日:1995-09-28

    IPC分类号: C07C67/307 C07F9/40 C07C69/65

    CPC分类号: C07F9/4015 C07C67/307

    摘要: A process for the preparation of alkyl esters of 0,0-dialkyl-4-phosphono-2-methyl-2-butenoic acid containing a high percentage of E isomers, wherein the corresponding alkyl esters of 2-hydroxy-2-methyl-3-butenoic acid are caused to react with PBr.sub.3 or PCl.sub.3 at temperatures ranging from 0.degree. to 80.degree. C. in the absence of pyridine and, if desired, the resulting mixture comprising predominantly alkyl esters of 4-halo-2-methyl-2-butenoic acid is caused to react with trialkyl esters of phosphorous acid at temperatures ranging from 70.degree. to 140.degree. C. The end products are desirable C.sub.5 building blocks for polyene syntheses or preceding stages.

    摘要翻译: 一种制备含有高百分比的E异构体的0-二烷基-4-膦酰基-2-甲基-2-丁烯酸的烷基酯的方法,其中相应的2-羟基-2-甲基-3 在不存在吡啶的情况下,在0℃至80℃的温度范围内引发 - 丁烯酸与PBr 3或PCl 3反应,如果需要,所得混合物主要包含4-卤代-2-甲基-2- 使丁烯酸在70℃至140℃的温度范围内与亚磷酸三烷基酯反应。最终产物是用于多烯合成或先前阶段的所需C5构建块。

    Preparation of alkyl O,O-dialkyl-.gamma.-phosphonotiglates
    15.
    发明授权
    Preparation of alkyl O,O-dialkyl-.gamma.-phosphonotiglates 失效
    烷基O,O-二烷基-γ-膦酸吡啶的制备

    公开(公告)号:US4937308A

    公开(公告)日:1990-06-26

    申请号:US205283

    申请日:1988-06-10

    IPC分类号: C07F9/40

    CPC分类号: C07F9/4015

    摘要: Alkyl .gamma.-halotiglates of the general formula I ##STR1## where X is Cl or Br and R.sup.2 is alkyl of 1 to 3 carbon atoms, having a high E isomer content, are prepared by a process in which(a) the corresponding 2-methyl-but-3-enoate of the general formula II ##STR2## is reacted with chlorine or bromine in the absence of a solvent and (b) the resulting 2-methyl-3,4-dihalobutyrate of the general formula III ##STR3## is dehydrohalogenated by reaction with a solution of an alkali metal hydroxide in an alcohol R.sup.2 OH, where R.sup.2 has the stated meaning, or in a mixture of water and an alcohol R.sup.2 OH, and the products are further processed to give O,O-dialkyl-.gamma.-phosphonotiglates of the general formula IV ##STR4## where R.sup.1 is alkyl of 1 to 4 carbon atoms and R.sup.2 is alkyl of 1 to 3 carbon atoms, preferably ethyl, by reaction with a trialkyl phosphite and thermal isomerization. The process gives C.sub.5 building blocks which are extremely interesting for polyene chemistry, the said building blocks being obtained in good yields and essentially in the form of the required E isomers.

    摘要翻译: 通过以下方法制备通式I的烷基γ-卤代吡咯烷酮,其中X是Cl或Br,R2是具有高E异构体含量的1至3个碳原子的烷基,其中(a) 在不存在溶剂的情况下,使通式II(II)的相应的2-甲基 - 丁-3-烯酸酯与氯或溴反应,和(b)所得的2-甲基-3,4-二卤代丁酸酯 通过与碱金属氢氧化物在醇R2OH中的溶液(其中R2具有所述含义)或在水和醇R2OH的混合物中进行反应脱卤化氢,并将产物进一步加工 得到通式IV(IV)的O,O-二烷基-γ-膦腈吡咯烷酮,其中R 1为1至4个碳原子的烷基,R 2为1至3个碳原子的烷基,优选为乙基,通过与 亚磷酸三烷基酯和热异构化。 该方法提供了对多烯化学非常有趣的C5构建块,所述构建块以良好的产率获得并且基本上以所需的E异构体的形式获得。

    Preparation of ribitylxylidine
    16.
    发明授权
    Preparation of ribitylxylidine 失效
    核苷酸的制备

    公开(公告)号:US4806686A

    公开(公告)日:1989-02-21

    申请号:US042823

    申请日:1987-04-27

    CPC分类号: C07H5/04

    摘要: N-(D)-ribitylxylidine (I) is prepared by reacting (D)-ribose (II) with 3,4-dimethylaniline (III) or 3,4-dimethyl-1-nitrobenzene (IV) in aqueous or aqueous/organic solution or in solution in a water-soluble organic solvent under an elevated hydrogen pressure and in the presence of a hydrogenation catalyst and of a boric acid compound,(a) using the boric acid compound in a catalytic amount of from about 6 to 35 mmol, preferably from 6 to 20 mmol, per mol of ribose,(b) carrying out the reaction under a hydrogen pressure of from 1 to 20, preferably from 2 to 9, bar and(c) carrying out the hydrogenation at from 40.degree. to 80.degree. C. over Raney nickel as hydrogenation catalyst.

    摘要翻译: 通过(D) - 核糖(II)与3,4-二甲基苯胺(III)或3,4-二甲基-1-硝基苯(IV)的水溶液或水/有机物(I)反应制备N-(D) - 二硫代吗啉 溶液或在水溶性有机溶剂中的溶液中,在升高的氢气压力下和在氢化催化剂和硼酸化合物的存在下,(a)使用催化量的约6至35mmol的硼酸化合物 ,优选6至20mmol,每摩尔核糖,(b)在1至20,优选2至9巴的氢气压力下进行反应,和(c)在40℃至40℃进行氢化 80℃,以阮内镍为加氢催化剂。

    Preparation of riboflavin, and
4,5-dimethyl-N-(D)-ribityl-2-(O-alkoxyphenylazo)-aniline intermediates
    18.
    发明授权
    Preparation of riboflavin, and 4,5-dimethyl-N-(D)-ribityl-2-(O-alkoxyphenylazo)-aniline intermediates 失效
    制备核黄素和4,5-二甲基-N-(D) - 二丙基-2-(O-烷氧基苯偶氮) - 苯胺中间体

    公开(公告)号:US4656275A

    公开(公告)日:1987-04-07

    申请号:US730056

    申请日:1985-05-03

    CPC分类号: C07D475/14

    摘要: An improved process for the preparation of riboflavin by condensation of a 4,5-dimethyl-N-(D)-ribityl-2-phenylazoaniline derivative with barbituric acid in the presence of an acidic condensing agent in an organic solvent, wherein a 4,5-dimethyl-N-(D)-ribityl-2-(o-alkoxyphenylazo)-aniline of the formula IIa ##STR1## where R is alkyl of 1 to 4 carbon atoms, in particular methyl, is reacted with barbituric acid, as well as the novel intermediates of the formula IIa.

    摘要翻译: 一种改进的制备核黄素的方法,其通过在酸性缩合剂存在下,在有机溶剂中使4,5-二甲基-N-(D) - 间苯基] -2-苯基偶氮苯胺衍生物与巴比妥酸缩合, 其中R是1至4个碳原子的烷基,特别是甲基的式IIa的(R) - (2-(O-)烷基-2-(邻 - 烷氧基苯基偶氮) - 苯胺其中R是与巴比妥酸反应, 以及式IIa的新型中间体。

    Novel optically active chroman derivatives, their preparation and novel
intermediates
    19.
    发明授权
    Novel optically active chroman derivatives, their preparation and novel intermediates 失效
    新型光学活性苯并二氢吡喃衍生物,其制备和新型中间体

    公开(公告)号:US4645845A

    公开(公告)日:1987-02-24

    申请号:US588365

    申请日:1984-03-12

    IPC分类号: C07D311/58 C07D311/72

    CPC分类号: C07D311/72

    摘要: Novel optically active chroman derivatives of the general formulae Ia and Ib ##STR1## where R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are each hydrogen or alkyl and X is --OH, --O--CO-alkyl, --O-alkyl, --O-tosyl, --O-mesyl, --O-benzenesulfonyl, Cl, Br or I, are prepared by a process in which(a) the racemate of the formula I' ##STR2## is esterified in the side chain with a carboxylic acid and then acylated with an optically active carboxylic acid halide of the general formula III ##STR3## or with the corresponding carboxylic anhydride, to give a chroman derivative IV ##STR4## or (b) the racemate I' is esterified in the side chain with the carboxylic acid from which III is derived, and, if required, the resulting ester is acylated with a carboxylic acid halide to give IV' ##STR5## the resulting mixture IV or IV', which consists of two diastereomers, is resolved by fractional crystallization, the diastereomers are hydrolyzed to the alcohols Ia and Ib and, if desired, these are converted to the other compounds Ia and Ib in a conventional manner.Useful optically active chroman derivatives Ia and Ib and diastereomeric chromanyl esters IV and IV' are also claimed.

    摘要翻译: (Ia)其中R 1,R 2,R 3和R 4各自为氢或烷基且X为-OH,-O-CO-烷基,(C 1 -C 6)烷氧基, -O-烷基,-O-甲苯磺酰基,-O-甲磺酰基,-O-苯磺酰基,Cl,Br或I是通过以下方法制备的,其中(a)式I'(I')的外消旋物 在侧链中用羧酸酯化,然后用通式III(III)的光学活性羧酸卤化物或相应的羧酸酐进行酰化,得到苯并二氢吡喃衍生物IV(IV) 或(b)外消旋物I'在侧链中与衍生自其的羧酸酯化,如果需要,将所得酯用羧酸卤化物酰化,得到IV'(IV') 由两个非对映异构体组成的所得混合物IV或IV'通过分级结晶来拆分,非对映异构体被水解成醇Ia和Ib,如果需要,它们是转化的 以常规方式与其它化合物Ia和Ib反应。 还要求有用的光学活性色氨酸衍生物Ia和Ib以及非对映异构的色满基酯IV和IV'。