申请人:Lehnemann Bernd Wilhelm
公开号:US20080214825A1
公开(公告)日:2008-09-04
Methods for producing substituted halopyridines (II) by reacting a β-hydroxy-y-acyl butyronitrile (I) or a suitable acyl-protected derivative with hydrogen halides, or substances or mixtures that can release hydrogen halides. In the formulae (I) and (II): R, R
4
represent H, a linear or branched alkyl group, optionally a substituted aryl group, an aralkyl group, or optionally a substituted heteroaryl group; R
1
, R
2
, R
3
represent H, a linear or branched alkyl group, optionally a substituted aryl, aralkyl, optionally a substituted heteroaryl group or one of the following groups C
n
H
(2n+1−m)
X
m
, COOR, or CN; R
5
represents H, a linear or branched alkyl group, optionally a substituted aryl group, an aralkyl, optionally a substituted heteroaryl or one of the following groups C
n
H
(2n+1−m)
X
m
, COOR, CN, SO
2
R, SOR, PO(OR)
2
; n represents a positive whole number; m represents a positive whole number ≦2n+1; and X represents F, Cl, Br, or I.
通过将β-羟基-γ-酰基丁腈(I)或适当的酰基保护衍生物与氢卤化物或能释放氢卤化物的物质或混合物反应,制备取代卤代吡啶(II)的方法。在公式(I)和(II)中:R、R4代表H、线性或支链烷基、可选取代芳基、芳基烷基、或可选取代杂芳基;R1、R2、R3代表H、线性或支链烷基、可选取代芳基、芳基烷基、或可选取代杂芳基或以下基团之一CnH(2n+1−m)Xm、COOR或CN;R5代表H、线性或支链烷基、可选取代芳基、芳基烷基、或可选取代杂芳基或以下基团之一CnH(2n+1−m)Xm、COOR、CN、SO2R、SOR、PO(OR)2;n代表正整数;m代表正整数≦2n+1;X代表F、Cl、Br或I。