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
    1.
    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。

    Epimerization of sugars, in particular of D-arabinose to D-ribose
    5.
    发明授权
    Epimerization of sugars, in particular of D-arabinose to D-ribose 失效
    糖异构化,特别是D-阿拉伯糖对D-核糖

    公开(公告)号:US4778531A

    公开(公告)日:1988-10-18

    申请号:US68171

    申请日:1987-06-30

    CPC分类号: C07H3/02

    摘要: 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.

    摘要翻译: 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。

    Preparation of canthaxanthin and astaxanthin
    9.
    发明授权
    Preparation of canthaxanthin and astaxanthin 失效
    甘氨酸和阿司匹林的制备

    公开(公告)号:US5210314A

    公开(公告)日:1993-05-11

    申请号:US695336

    申请日:1991-04-29

    摘要: A process for preparing canthaxanthin (Ia) and astaxanthin (Ib) of the formula I ##STR1##where R is H (a) or OH (b), comprises reacting a tertiary alcohol of the formula II ##STR2##where R is H (a) or OH (b), with trifluoroacetic acid, reacting the resulting novel trifluoroacetate of the formula III ##STR3##with triphenylphosphine, and reacting the resulting novel triphenylphosphonium trifluoroacetate of the formula IV ##STR4## with 2,7-dimethyl-2,4,6-octatriene-1,8-dial under the conditions of a Wittig synthesis. The present invention also relates to the novel trifluoroacetates of the formula III and the corresponding triphenylphosphonium trifluoroacetates of the formula IV.

    摘要翻译: 制备式I的角黄素(Ia)和虾青素(Ib)的方法,其中R是H(a)或OH(b))包括使式II的叔醇(II)与R (III)的三氟乙酸盐与三苯基膦反应,并使得到的式IV的三氟化三苯基鏻(Ⅳ)与式(Ⅳ)化合物反应,得到新的三氟乙酸盐, 在Wittig合成条件下用2,7-二甲基-2,4,6-辛二烯-1,8-表盘。 本发明还涉及式III的新型三氟乙酸盐和式Ⅳ相应的三苯基三氟乙酸盐。

    Preparation of 2-n-propyl-4-amino-5-methoxymethyl-pyrimidine
    10.
    发明授权
    Preparation of 2-n-propyl-4-amino-5-methoxymethyl-pyrimidine 失效
    2-正丙基-4-氨基-5-甲氧基甲基 - 嘧啶的制备

    公开(公告)号:US4918191A

    公开(公告)日:1990-04-17

    申请号:US393976

    申请日:1989-08-15

    IPC分类号: C07D239/42

    CPC分类号: C07D239/42

    摘要: In an improved process for the preparation of 2-n-propyl-4-amino-5-methoxymethyl-pyrimidine of the formula I ##STR1## by reacting butyramidine II ##STR2## with .alpha.-methoxymethyl-.beta.-methoxyacrylonitrile III ##STR3## the butyramidine II is reacted with a 0.4-5 molar excess of .alpha.-methoxymethyl-.beta.-methoxyacrylonitrile III at from -10.degree. to +20.degree. C.

    摘要翻译: 通过使丁酰脒II II与α​​-甲氧基甲基-β-甲氧基丙烯腈III反应制备式I的2-正丙基-4-氨基-5-甲氧基甲基 - 嘧啶的改进方法III IMA图 > III,在-10℃至+ 20℃下,使丁酰脒II与0.4-5摩尔过量的α-甲氧基甲基-β-甲氧基丙烯腈III反应。