申请人:Hoffmann-La Roche Inc.
公开号:US06080866A1
公开(公告)日:2000-06-27
The present invention concerns a process for the preparation of a 2,5 disubstituted pyridine of the formula (I) ##STR1## which comprises the steps of a) reacting a compound of the formula (II) R.sup.1 --CH.dbd.CH--R.sup.2 (II) with an acrylic compound of the formula (III) ##STR2## to form a compound of the formula (IV) ##STR3## and b) reacting the compound of formula (IV) under water free conditions with a hydrogen halide in which formula R.sup.1 signifies lower alkyl, R.sup.2 signifies di-(lower alkyl)amino or a 5- or 6-membered --N-heterocyclyl group having the free valence bond at the nitrogen atom, and X signifies halogen.
本发明涉及一种制备式(I)的2,5-二取代吡啶的方法,其中包括以下步骤:a)将式(II)的化合物R1-CH=CH-R2(II)与式(III)的丙烯酸化合物反应,得到式(IV)的化合物;b)在无水条件下将式(IV)的化合物与氢卤酸反应。其中,R1表示低烷基,R2表示二-(低烷基)氨基或具有氮原子上的自由价键的5或6元杂环基,X表示卤素。