申请人:D'AMBRA Thomas E.
公开号:US20100010227A1
公开(公告)日:2010-01-14
The present invention discloses a process for preparing the piperidine derivative compound 4-[4-[4-hydroxydiphenylmethyl)-1-piperidinyl]-1-hydroxybutyl]-α,α-dimethylphenylacetic acid of formula
comprising the sequential steps of: (1) reacting 4-bromo-α,α-dimethyl-α-(4,4-dimethylisoxazolin-2-yl)toluene with 4-chlorobutyryl chloride to provide 4-(4-chloro-1-oxobutyl)-α,α-dimethyl-α-(4,4-dimethylisoxazolin-2-yl)toluene; (2) hydrolyzing said 4-(4-chloro-1-oxobutyl)-α,α-dimethyl-α-(4,4-dimethylisoxazolin-2-yl)toluene to provide 4-(4-chloro-1-oxobutyl)-α,α-dimethylphenylacetic acid; (3) reacting said 4-(4-chloro-1-oxobutyl)-α,α-dimethylphenylacetic acid with methanol to provide methyl 4-(4-chloro-1-oxobutyl)-α,α-dimethylphenylacetate; (4) reacting said methyl 4-(4-chloro-1-oxobutyl)-α,α-dimethylphenylacetate with 4-(α,α-diphenyl)piperidinemethanol to provide methyl 4-[4-[4-(hydroxydiphenylmethyl)-1-piperidinyl]-1-oxobutyl]-α,α-dimethylphenylacetate; (5) reducing said methyl 4-[4-[4-(hydroxydiphenylmethyl)-1-piperidinyl]-1-oxobutyl]-α,α-dimethylphenylacetate to provide methyl 4-[4-[4-(hydroxydiphenylmethyl)-1-piperidinyl]-1-hydroxybutyl]-α,α-dimethylphenylacetate; and (6) hydrolyzing said methyl 4-[4-[4-(hydroxydiphenylmethyl)-1-piperidinyl]-1-hydroxybutyl]-α,α-dimethylphenylacetate to provide said 4-[4-[4-hydroxydiphenylmethyl)-1-piperidinyl]-1-hydroxybutyl]-α,α-dimethylphenylacetic acid.
本发明揭示了一种制备式为4-[4-[4-羟基二苯甲基)-1-哌啶基]-1-羟基丁基]-α,α-二甲基苯乙酸的哌啶衍生物化合物的方法,包括以下步骤:(1)将4-溴-α,α-二甲基-α-(4,4-二甲基异恶唑-2-基)甲苯与4-氯丁酰氯反应,得到4-(4-氯-1-氧代丁基)-α,α-二甲基-α-(4,4-二甲基异恶唑-2-基)甲苯;(2)水解所述的4-(4-氯-1-氧代丁基)-α,α-二甲基-α-(4,4-二甲基异恶唑-2-基)甲苯,得到4-(4-氯-1-氧代丁基)-α,α-二甲基苯乙酸;(3)将所述的4-(4-氯-1-氧代丁基)-α,α-二甲基苯乙酸与甲醇反应,得到甲基4-(4-氯-1-氧代丁基)-α,α-二甲基苯乙酸酯;(4)将所述的甲基4-(4-氯-1-氧代丁基)-α,α-二甲基苯乙酸酯与4-(α,α-二苯基)哌啶甲醇反应,得到甲基4-[4-[4-(羟基二苯甲基)-1-哌啶基]-1-氧代丁基]-α,α-二甲基苯乙酸酯;(5)将所述的甲基4-[4-[4-(羟基二苯甲基)-1-哌啶基]-1-氧代丁基]-α,α-二甲基苯乙酸酯还原,得到甲基4-[4-[4-(羟基二苯甲基)-1-哌啶基]-1-羟基丁基]-α,α-二甲基苯乙酸酯;(6)水解所述的甲基4-[4-[4-(羟基二苯甲基)-1-哌啶基]-1-羟基丁基]-α,α-二甲基苯乙酸酯,得到所述的4-[4-[4-羟基二苯甲基)-1-哌啶基]-1-羟基丁基]-α,α-二甲基苯乙酸。