申请人:Tyrrell Nicholas David
公开号:US20090221828A1
公开(公告)日:2009-09-03
A process for preparing 1-halo-2,7-naphthyridinyl derivatives is described (I), wherein X is Cl or Br; which process comprises the following steps: (i) reaction of a 3-cyano-4-methylpyridine derivative of formula (A): with a compound of formula (II), in the presence of an N,N-dimethylformamide diC
1-6
alkylacetal; to give an enamine derivative of formula (III), (ii) cyclisation of the enamine of formula (III), to obtain the compound of formula (IV), (iii) reaction of the compound of formula (IV) with a halogenating agent, to obtain a compound of formula (I).
本发明涉及一种制备1-卤代-2,7-萘啶衍生物的方法(I),其中X为Cl或Br;该方法包括以下步骤:(i)将式(A)的3-氰基-4-甲基吡啶衍生物与式(II)的化合物在N,N-二甲基甲酰胺二C1-6烷基缩醛的存在下反应,得到式(III)的恩酰衍生物;(ii)将式(III)的恩酰衍生物环化,得到式(IV)的化合物;(iii)将式(IV)的化合物与卤化剂反应,得到式(I)的化合物。