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    • 2. 发明申请
    • PROCESS FOR THE PREPARATION OF B-IONONES AND VITAMIN A, VITAMIN A DERIVATIVES, CAROTENES AND CAROTENOIDS
    • 制备B-离子和维生素A的维生素A,维生素A衍生物,卡诺斯和卡诺菌素的方法
    • US20100312016A1
    • 2010-12-09
    • US12444767
    • 2007-11-12
    • Andreas LuettinClaude Stritt
    • Andreas LuettinClaude Stritt
    • C07C49/203C07C35/18
    • C07C403/08C07C403/16C07C403/24C07C2601/16
    • The present invention relates to a process for the preparation of β-ionones and/or α-ionones of the formulae (II) and (III) by acid catalyzed ring-closing of ψ-ionone of the formula (I) wherein R1 to R7 are independently selected from hydrogen and C1-C4-alkyl, R8 is selected from hydrogen and C1-C4-alkyl and the hydroxyl group, R9 and R10 are independently selected from hydrogen and C1-C4-alkyl or R9 and R10 form together the oxygen of a carbonyl group, whereby if R9 and R10 form together the oxygen of a carbonyl group no α-isomer is formed comprising: a) reacting a ψ-ionone according to formula (I) in presence of a concentrated Brønsted-acid having a pKs
    • 本发明涉及通过式(I)的ψ-紫罗酮酮的酸催化闭环来制备式(II)和(III)的铋和/或α-紫罗兰酮的方法,其中R1至 R 7独立地选自氢和C 1 -C 4 - 烷基,R 8选自氢和C 1 -C 4 - 烷基,羟基,R 9和R 10独立地选自氢和C 1 -C 4烷基或R 9和R 10一起形成 羰基的氧,其中如果R 9和R 10一起形成羰基的氧,则不形成α-异构体,其包含:a)使具有式(I)的Ψ-紫罗酮在浓缩的布朗斯台德酸 pKs <3,以及与浓酸基本上不混溶并且与所述酸的稀释水溶液基本上不混溶的有机溶剂; b)通过加入水来水解步骤a)中获得的反应产物; 和相分离成包含式(II)和(III)的β-二酮和/或α-紫罗酮酮的有机相并进入水性稀酸相中; 其中在水解步骤b)中以在所述水性稀酸相中达到酸浓度为45至65重量%的量加入水,其也可以容易地与维生素A的制备方法 衍生物,胡萝卜素或类胡萝卜素。