A process for the preparation of compounds of formula (1), wherein R
1
is C
1
-C
6
alkyl and X is hydrogen, a hydrocarbon radical or a cation, wherein a compound of formula (2), wherein R
1
is as defined above and R
2
is hydrogen or a hydrocarbon radical, is reduced, the resulting compound of formula (3) is reacted with a compound that introduces the radical of formula —CH
2
—COOR
3
, wherein R
3
has the meanings given above for R
2
, and the resulting compound of formula (4) is reduced and optionally hydrolysed.
                            一种制备化合物的方法,该化合物的
化学式为(1),其中R1是C1-C6烷基,X是氢、烃基或阳离子,其中化合物的
化学式为(2),其中R1如上定义,R2是氢或烃基,被还原,得到的化合物的
化学式为(3),与引入
化学式—
CH2—COOR3的基团的化合物反应,其中R3具有上述所述的R2的含义,得到的化合物的
化学式为(4),被还原并可选择性地
水解。