申请人:BASF Aktiengesellschaft
公开号:US04550182A1
公开(公告)日:1985-10-29
A process for the preparation of .alpha.-tocopherol of the formula I ##STR1## by reacting a chroman derivative with a C.sub.14 -Grignard reagent using a di-alkali metal tetrahalocuprate catalyst in a Schlosser-Fouquet reaction, wherein a chroman derivative of the general formula II ##STR2## where Y is a leaving group, especially Br, is used and is reacted, at from -70.degree. to 0.degree. C., first with a solution of about 1 equivalent of a Grignard compound of the general formula III X--Mg--R (III) where X is Cl, Br or I and R is straight-chain or branched alkyl of 1 to 14 carbon atoms, preferably methyl, ethyl or ##STR3## and then with a solution of a Grignard reagent of the formula IIIa ##STR4## in an ether solvent and a solution of a di-alkali metal tetrahalocuprate in an ether solvent. The novel process simplifies the preparation of 2RS,4'RS,8'RS-, 2R,4'RS,8'RS- or 2R,4'R,8'R-.alpha.-tocopherol by reacting a chroman structural unit, containing a C.sub.2 side-chain in the 2-position, with the corresponding C.sub.14 -Grignard compound.
一种制备公式I的α-生育酚的方法##STR1##,通过在Schlosser-Fouquet反应中使用二元碱金属四卤化铜催化剂,将色苷衍生物与C.sub.14-Grignard试剂反应,其中使用具有通式II的色苷衍生物##STR2##其中Y是离去基团,特别是Br,并在-70℃至0℃之间首先与通式III X-Mg-R(III)的Grignard化合物的约1当量的溶液反应,其中X为Cl,Br或I,R为1至14个碳原子的直链或支链烷基,优选为甲基,乙基或##STR3##然后与以太溶剂中的IIIa式Grignard试剂的溶液和二元碱金属四卤化铜的溶液反应。该新方法通过将含有C.sub.2侧链的色苷结构单元与相应的C.sub.14-Grignard化合物反应,简化了2RS,4'RS,8'RS-,2R,4'RS,8'RS-或2R,4'R,8'R-α-生育酚的制备。