申请人:Dong Kook Pharmaceutical Co., Ltd.
公开号:US05414156A1
公开(公告)日:1995-05-09
This invention relates to the process for producing ortho-isopropylated phenol derivatives having following general formula (VIII). ##STR1## (in the above formula, R.sub.1 is a hydrogen or a low alkyl group of C.sub.1 -C.sub.4) A process for producing ortho-isopropylated phenol derivatives (VIII) of the present invention is characterized by obtaining position isomer desired by means of Claisen rearrangement of phenyl allyl ether without catalyst in atmosphere, and then obtaining only one isomer by oxidation and reduction of the above-obtained position isomer. According to the present invention, ortho-alkylated phenol derivatives (VIII) having high purity at low temperature and low pressure can be prepared without producing a by-product and requirement of the complicated separation procedure.
这项发明涉及制备具有以下一般式(VIII)的邻异丙基酚衍生物的过程。在上述式中,R.sub.1是氢或C.sub.1-C.sub.4的低烷基基团。本发明的制备邻异丙基酚衍生物(VIII)的过程的特征在于,通过在无催化剂的大气中进行苯基烯醇醚的克莱森重排来获得所需的位置异构体,然后通过氧化和还原上述获得的位置异构体来获得仅一种异构体。根据本发明,在低温低压下可以制备高纯度的邻烷基化酚衍生物(VIII),而无需产生副产物并且无需复杂的分离程序要求。