Process for the manufacture of chroman derivatives, especially alpha-tocopherol and alkanoates thereof
申请人:Bonrath Werner
公开号:US20050277777A1
公开(公告)日:2005-12-15
The present invention relates to novel processes for the manufacture of chroman derivatives such as α-tocopherol (TCP) and alkanoates thereof, especially α-tocopheryl acetate (TCPA), whereby at least one step of the processes is carried out in the presence of a Lewis acid or a mixture of a Lewis acid with a Bronsted acid as the catalyst under pressure, preferably at an absolute pressure of at least 1.1 bar. As starting materials for the manufacture of TCP and its alkanoates either a mixture of 2,3,5-trimethylhydroquinone (TMHQ) or 2,3,6-trimethylhydroquinone-1-alkanoate (TMHQA) and a compound selected from the group consisting of phytol (pH), isophytol (IP) and (iso)phytol derivatives or 2-phytyl-3,5,6-trimethyl-hydroquinone (PTMHQ)/3-phytyl-2,5,6-trimethylhydroquinone-1-alkanoate (PTMHQA) and/or an isomer thereof are used. Suitable Lewis acids are indium(III) salts and scandium(III) salts. Suitable acid mixtures are iron/iron(II) chloride/hydrogen chloride and zinc(II) chloride/hydrogen chloride.
本发明涉及一种制备类似α-生育酚(TCP)和其烷酸酯,特别是α-生育酚醋酸酯(TCPA)的新型过程,其中所述过程的至少一步在Lewis酸或Lewis酸与Bronsted酸的混合物存在下,在压力下进行,优选在至少1.1巴的绝对压力下进行。用于制备TCP及其烷酸酯的起始材料可以是2,3,5-三甲基对苯二酚(TMHQ)或2,3,6-三甲基对苯二酚-1-烷酸酯(TMHQA)的混合物和从菲醇(pH)、异菲醇(IP)和(异)菲醇衍生物或2-菲基-3,5,6-三甲基-对苯二酚(PTMHQ)/3-菲基-2,5,6-三甲基对苯二酚-1-烷酸酯(PTMHQA)和/或其异构体中选择的化合物。适用的Lewis酸包括铟(III)盐和钪(III)盐。适用的酸混合物包括铁/二氯化亚铁/氯化氢和锌(II)氯化物/氯化氢。