申请人:Pfizer, Inc.
公开号:US04839104A1
公开(公告)日:1989-06-13
A novel three-step process for preparing 4-(3,4-dichlorophenyl)-4-phenylbutanoic acid is disclosed, which involves (1) reducing 4-(3,4-dichlorophenyl)-4-ketobutanoic acid to 4-(3,4-dichlorophenyl)-4-hydroxybutanoic acid; (2) then converting the intermediate hydroxy acid formed in the first step to 5-(3,4-dichlorophenyl)-dihydro-2(3H)-furanone, and (3) thereafter reacting the resulting gamma-butyrolactone compound with benzene in a Friedel-Crafts type reaction to form the desired final product. The latter compound is known to be useful as an intermediate leading to 4-(3,4-dichlorophenyl)-3,4-dihydro-1(2H)-naphthalenone and ultimately, to cis-(1S)(4S)-N-methyl-4-(3,4-dichlorophenyl)-1,2,3,4-tetrahydro-1-naphthal ene amine (sertraline), which is known to be a preferred anti-depressant agent in the field of medicinal chemistry. The aforementioned 5-(3,4-dichlorophenyl)-dihydro-2(3H)-furanone and 4-(3,4-dichlorophenyl)-4-hydroxybutanoic acid are both novel compounds. There is also disclosed a novel process for converting 5-(3,4-dichlorophenyl)-dihydro-2(3H)-furanone directly to 4-(3,4-dichlorophenyl)-3,4-dihydro-1(2H)-naphthalenone, as well as an alternate novel process for converting 4-(3,4-dichlorophenyl)-4-hydroxybutanoic acid directly to this same key intermediate.
本发明公开了一种制备4-(3,4-二氯苯基)-4-苯基丁酸的新型三步法,其中包括(1)将4-(3,4-二氯苯基)-4-酮丁酸还原为4-(3,4-二氯苯基)-4-羟基丁酸;(2)然后将第一步中形成的中间体羟基酸转化为5-(3,4-二氯苯基)-二氢-2(3H)-呋喃酮;(3)然后将得到的γ-丁内酯化合物与苯在Friedel-Crafts类型反应中反应,形成所需的最终产物。后一种化合物已知可用作导致4-(3,4-二氯苯基)-3,4-二氢-1(2H)-萘酮和最终的顺式-(1S)(4S)-N-甲基-4-(3,4-二氯苯基)-1,2,3,4-四氢-1-萘乙胺(舍曲林)的中间体,后者已知是药物化学领域中优选的抗抑郁剂。上述的5-(3,4-二氯苯基)-二氢-2(3H)-呋喃酮和4-(3,4-二氯苯基)-4-羟基丁酸都是新型化合物。还公开了将5-(3,4-二氯苯基)-二氢-2(3H)-呋喃酮直接转化为4-(3,4-二氯苯基)-3,4-二氢-1(2H)-萘酮的新型过程,以及将4-(3,4-二氯苯基)-4-羟基丁酸直接转化为这种关键中间体的另一种新型过程。