The acid VI, obtained from 2,5-difluorothiophenol (IV) and (2-iodophenyl)acetic acid, afforded by cyclization with polyphosphoric acid 6,9-difluorodibenzo[b,f]thiepin-10(11H)-one (VII) in a satisfactory yield. Two further steps led to the chloro derivative X giving by a substitution reaction with 1-methylpiperazine the title compound III. This substance exhibits some 10% incoordinating activity of the unsubstituted compound I and an indication of cataleptic activity, in contrast to the inactive analogous dichloro compound II. The bulky atom of chlorine in the vicinity of the methylpiperazine residue interferes evidently with the CNS activity; the influence of the atom of fluorine is much less pronounced in this line.
从2,5-二氟硫酚(IV)和(2-碘苯基)乙酸获得的酸VI,通过与多聚磷酸环化得到6,9-二氟二苯并[bf]噻吩-10(11H)-酮(VII),收率满意。经过两个进一步的步骤得到氯衍生物X,通过与1-甲基哌嗪的取代反应获得标题化合物III。这种物质表现出约10%的非协调活性,与无取代化合物I相比,显示出痉挛活性的迹象,与无活性的类似二氯化合物II形成对比。氯原子在甲基哌嗪残基附近的庞大影响显然干扰了中枢神经系统的活性;氟原子对这一领域的影响要小得多。