The present invention relates to a process for the preparation of a compound of the formula (I), wherein R is C1-12 alkyl, by the contact of a compound of the general formula (II) , wherein R1 and R2 are each, independently, C1-12 alkyl; or R1 and R2 join together with the nitrogen atom to which they are attached to form an alicyclic amine ring containing 4 to 7 carbon atoms or a morpholine ring, with an acetic acid ester of the general formula (III) CH3COOR, wherein R is as defined under formula (I), in the presence of a base.
本发明涉及一种制备式(I)化合物的方法,其中R为C1-12烷基,通过将一般式(II)化合物与一般式(III)CH3COOR的
乙酸酯在碱的存在下接触,其中R1和R2各自独立地为C1-12烷基;或者R1和R2与它们连接的氮原子结合在一起形成含有4到7个碳原子的脂环胺环或吗啉环。