The invention relates to 3-ketoester of formula (IV)
wherein R1 represents a 2, 3 or 4-pyridine ring optionally substituted by a C3-6 cycloalkyl group, a C1-4 alkyl group, a C1-4 alkoxy group, a benzyl group or a halogen atom, R5 is an halogen atom and R is an alkyl.
本发明涉及式(IV)的 3-
酮酯
其中 R1 代表任选被 C3-6 环烷基、C1-4 烷基、C1-4 烷氧基、苄基或卤素原子取代的 2、3 或 4
吡啶环,R5 为卤素原子,R 为烷基。