Syntheses of 4-(benzo[<i>b</i>]furan-2 or 3-yl)- and 4-(benzo[<i>b</i>]-thiophen-3-yl)piperidines with 5-HT<sub>2</sub>antagonist activity
作者:Yoshifumi Watanabe、Hirotaka Yoshiwara、Munefumi Kanao
DOI:10.1002/jhet.5570300228
日期:1993.3
The syntheses of 4-(benzo[b]furan-3-yl)piperidines, 4-(benzo[b]furan-2-yl)piperidines and 4-(benzo[b]thiophen-3-yl)piperidines with 5-HT2 antagonist activity are described. Reaction of 1-acetyl-4-(2,4-difluorobenzo-yl)piperidine 2 with methyl glycolate gave methyl 6-fluoro-3-(1-acetylpiperidin-4-yl)benzo[b]furan-2-carboxylate 3, which was converted to 2-[2-[4-(benzo[b]furan-3-yi)piperidin-1-yl]ethyl-5
4-(苯并[ b ]呋喃-3-基)哌啶,4-(苯并[ b ]呋喃-2-基)哌啶和4-(苯并[ b ]噻吩-3-基)哌啶的合成与5-描述了HT 2拮抗剂活性。1-乙酰基-4-(2,4-二氟苯甲酰基)哌啶2与乙醇酸甲酯反应,得到6-氟-3-(1-乙酰基哌啶-4-基)苯并[ b ]呋喃-2-羧酸甲酯3,将其转化为2- [2- [4-(苯并[ b ]呋喃-3-乙氧基]哌啶-1-基]乙基-5,6,7,8-四氢-1,2,4-三唑-[ 4,3-一]吡啶-3(2 H)一盐酸盐9。类似的苯并[ b ]呋喃17a-d苯并[ b ]噻吩10a,b和18a通过类似的方法制备。将4-氟-2-(4-吡啶基甲氧基)苯乙酮环化,得到4-(苯并[ b ]呋喃-2-基)吡啶21a,b,将其转化为2- [2- [4-(苯并] [ b ]呋喃-2-基)-哌啶-1-基]乙基5,6,7,8-四氢-1,2,4-三唑并[4,3- a ]吡啶-3(2