The present invention is directed to a process for the preparation of certain N-substituted -2-haloacetanilides via the reaction of a secondary 2-haloacetanilide with a haloalkyl ether, particularly, halomethyl ethers, which comprises forming the ether in situ by the in-solvent reaction of an alcohol, formaldehyde or other aldehyde and an acid halide to produce high purity haloalkyl ethers, while decreasing the concentration of undesirable bis by products, as for example bis(chloromethyl) ether. The ether formed in situ thereafter reacts with the secondary 2-haloacetanilide in the presence of a phase transfer catalyst and base to form the N-substituted-2-haloacetanilide.
本发明涉及一种通过仲2-卤
乙酰苯胺与卤代烷基醚,特别是卤代
甲基醚反应制备某些N-取代-2-卤
乙酰苯胺的工艺,该工艺包括通过醇、
甲醛或其他醛与酸卤化物的溶剂内反应原位形成醚,以生成高纯度的卤代烷基醚,同时降低不良双副产物,如双(
氯甲基)醚的浓度。随后,原位形成的醚在相转移
催化剂和碱的作用下与仲基 2-卤代
乙酰苯胺反应,形成 N-取代的 2-卤代
乙酰苯胺。