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    • 9. 发明申请
    • MANUFACTURE OF VITAMIN B6
    • 维生素B6的制备
    • WO2005049618A1
    • 2005-06-02
    • PCT/EP2004/012655
    • 2004-11-09
    • DSM IP ASSETS B.V.FISCHESSER, JocelynFRITSCH, HelmutGUM, Andrew, GeorgeKARGE, ReinhardKEUPER, Ralf
    • FISCHESSER, JocelynFRITSCH, HelmutGUM, Andrew, GeorgeKARGE, ReinhardKEUPER, Ralf
    • C07D491/04
    • C07D491/04Y02P20/582
    • A process for manufacturing a 3-unsubstituted, 3-monosubstituted or 3,3-disubstituted 9-acyloxy-1,5-dihydro-8-­methylpyrido[3,4-e] [1,3]dioxepin (I) and optionally for manufacturing pyridoxine involves performing an addition reaction between a 4-methyl-5-alkoxy-oxazole (II) and a 2-unsubstituted, 2-monosubstituted or 2,2-disubstituted 4,7-dihydro-(1,3)-dioxepin (III) in the substantial absence of a solvent and a catalyst to give a product mixture consisting essentially of the appropriate Diels-Alder adduct (IV) in a major proportion and the appropriate 3-­unsubstituted, 3-monosubstituted or 3,3-disubstituted 1,5-dihydro-8-methylpyrido[3,4-e] [1,3]dioxepin 9-ol (V) in a minor proportion, removal of a substantial proportion of the unreacted oxazole and dioxapin starting materials from the product mixture by distillation under reduced pressure, addition of a substantially anhydrous organic acid to said product mixture and rearrangement of the Diels-Alder adduct IV to further V in the presence of said substantially anhydrous organic acid with removal of the generated alkanol by distillation under reduced pressure, and acylation of the resultingly enriched quantity of V with an added carboxylic acid anhydride to produce the desired I, and optionally converting this so-manufactured acylation product I to pyridoxine by acid hydrolysis for achieving deprotection and deacylatiom. Pyridoxine is a well known form of vitamin B 6 with well established utility.
    • 制备3-未取代的3-单取代的或3,3-二取代的9-酰氧基-1,5-二氢-8-甲基吡啶并[3,4-e] [1,3]二氧杂环庚烯(I)的方法, 制备吡哆醛涉及在4-甲基-5-烷氧基 - 恶唑(II)和2-未取代的2-单取代或2,2-二取代的4,7-二氢 - (1,3)二氧杂环己烷 III)在基本上不存在溶剂和催化剂的情况下得到基本上由主要比例的合适的狄尔斯 - 阿尔德加合物(IV)组成的产物混合物和合适的3-未取代的3-单取代的或3,3-二取代的1 ,5-二氢-8-甲基吡啶并[3,4-e] [1,3]二氧杂环庚烷-9-醇(V),少量比例地从产物混合物中除去大部分未反应的恶唑和二氧杂环己烯起始原料 在减压下蒸馏,向所述产物混合物中加入基本上无水的有机酸,并且将狄尔斯 - 阿尔德加合物IV重新排列成pr 通过减压蒸馏除去生成的链烷醇,然后用加入的羧酸酐酰化所得的富集量的V,从而产生所需的I,并且任选地将这样制得的酰化产物I 通过酸水解获得吡哆醛,以实现去保护和脱酰基。 吡哆素是众所周知的维生素B6形式,具有很好的实用性。