A process for the synthesis of arylpiperidine carbinol intermediates and derivatives is disclosed. A preferred process embodiment provides the synthesis of intermediate compounds of structural formula (I) and structural formula (II):
1
where X is halo, C
1
-C
10
alkoxy, C
1
-C
10
haloalkyl, or hydroxy; R
2
and R
3
are each C
1
-C
4
alkyl, and R
2
and R
3
are the same. The compound of structural formula (I) is made by condensing a corresponding cinnamonitrile with a corresponding diester malonate. The compound of structural formula (II) in the (±)-trans configuration is obtained by hydrogenating the compound of structural formula (I). The compounds of structural formula (I) and structural formula (II) are useful chemical intermediates for synthesizing 4-arylpiperidine-3-carbinols and their derivatives in (−)-trans configuration.
本发明揭示了一种合成芳基
哌啶羧醇
中间体和衍
生物的方法。首选的方法实施方式提供了结构式(I)和结构式(II)的中间化合物的合成:其中X是卤素,C1-C10烷
氧基,C1-C10卤代烷基或羟基;R2和R3均为C1-C4烷基,并且R2和R3相同。结构式(I)的化合物是通过将相应的
肉桂腈与相应的二
酯丙二酸酯缩合而制得的。在(±)-反式构型下,通过
氢化结构式(I)的化合物可获得结构式(II)的化合物。结构式(I)和结构式(II)的化合物是合成(-)-反式构型的4-芳基
哌啶-3-羧醇及其衍
生物的有用
化学中间体。