| 摘要 |
The present invention relates to a process for the preparation of a compound of the formula (I), wherein R is C<SUB>1-12 </SUB>alkyl, by the contact of a compound of the general formula (II), wherein R<SUB>1 </SUB>and R<SUB>2 </SUB>are each, independently, C<SUB>1-12 </SUB>alkyl; or R<SUB>1 </SUB>and R<SUB>2 </SUB>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) CH<SUB>3</SUB>COOR, wherein R is as defined under formula (I), in the presence of a base. |
