The present invention concerns a process for the preparation of a compound of formula (I) in the form of any one of its stereoisomers or mixtures thereof, wherein R represents a C
2
-C
10
group of formula COR
a
wherein R
a
is an alkyl or alkenyl group optionally comprising one or two ether functional groups or is a phenyl or benzyl group optionally substituted by one to three alkyl, alkoxyl, carboxyl, acyl, amino or nitro groups or halogen atoms.
本发明涉及一种制备式(I)化合物的方法,该化合物形式可以是其任何一个立体异构体或它们的混合物,其中R代表公式CORa的C2-C10基团,其中Ra是一种烷基或烯基基团,可选地包含一或两个醚官能团,或是苯基或苄基基团,可选地被一到三个烷基、烷氧基、羧基、酰基、
氨基或硝基基团或卤素原子取代。