Alkylation of 1-ethoxycarbonylpiperazine with 4-fluorobenzyl bromide, 2-(4-fluorophenyl)ethyl bromide and 4,4-bis(4-fluorophenyl)butyl bromide gave the carbamates IIa, IIb and IIf. Two further similar compounds (IIc, IId) were obtained by reactions of 1-(2-chloroethyl)-4-ethoxycarbonylpiperazine with 4-fluorophenol, and with 4-fluorothiophenol, respectively. Hydrolysis of carbamates IIa-f resulted in piperazine derivatives IIIa-f affording the title compounds by substitution reactions with 2,11-dichloro-10,11-dihydrodibenzo[b,f]thiepin. Out of the compounds prepared only the fluorophenethyl derivative Ib and the fluorobenzoylpropyl derivative Ie maintain the neuroleptic character, i.e. clear central depressant and cataleptic activity.
用4-氟苄基溴、2-(4-氟苯基)乙基溴和4,4-双(4-氟苯基)丁基溴对1-乙氧羰基哌嗪进行烷基化反应,得到了羰酸酯IIa、IIb和IIf。通过1-(2-氯乙基)-4-乙氧羰基哌嗪与4-氟苯酚和4-氟硫酚反应,还得到了两种类似的化合物(IIc、IId)。羰酸酯IIa-f的水解产生哌嗪衍生物IIIa-f,通过与2,11-二氯-10,11-二氢二苯并[b,f]噻吩的取代反应得到了目标化合物。制备的化合物中,只有氟苯乙基衍生物Ib和氟苯甲酰丙基衍生物Ie保持了神经类药物的特性,即具有明显的中枢抑制和僵直活性。