| 摘要 |
<p>The invention relates to a method for producing a compound of general formula (I). The method is characterized in that a compound of general formula (II), wherein R1, R2, A, X and n have the meanings given in general formula (I) and wherein at least one of the positions situated in para or in ortho of the amine function is free; is reacted with a sufficient quantity of halohydric acid HY, with Y having the meaning given in the general formula, in the presence of an oxidizing agent that is capable of consuming H+ protons. The reaction is carried out under such conditions of acidity that at least part of the compound of general formula (II) is in a protonated form when it comes into contact with the oxidizing agent and that said compound of general formula (I) is obtained.</p> |
