Collect. Czech. Chem. Commun. 1983, 48, 144-155

Fluorinated tricyclic neuroleptics with prolonged action: 3-Fluoro-10-[4-(2-hydroxyethyl)piperazino]-10,11-dihydrodibenzo[b,f]thiepins with less common substituents in position 8

Karel Šindelář, Jiřina Metyšová, Jiří Holubek, Emil Svátek, Miroslav Ryska and Miroslav Protiva

Research Institute for Pharmacy and Biochemistry, 130 60 Prague 3


Cyclization of [4-fluoro-2-(4-nitrophenylthio)phenyl]acetic acid resulted in 3-fluoro-8-nitrodibenzo[b,f]thiepin-10(11H)-one (IIa) which was transformed via the intermediates IVa and Va to the compound Ia. Its reduction gave the amino alcohol Ib. 8-Amino-3-fluorodibenzo[b,f]thiepin-10(11H)-one (IIb) was diazotized and the diazonium salt was converted by treatment with sulfur dioxide and cuprous chloride, followed by dimethylamine, to the N,N-dimethylsulfonamide IIc. Its processing via the intermediates IVc and Vc afforded Ic. Reduction of the amino ketone IIb gave the amino alcohol IVb which was transformed by the Beech method to the hydroxy ketone IVd. Id was obtained via the chloro derivative Vd. A reaction of 3-fluoro-8-iodo-10,11-dihydrodibenzo[b,f]thiepin-10-ol with cuprous cyanide in dimethylformamide led to the cyano alcohol IVe which was used for concluding the synthesis of Ie. Compounds Ia - Id are neuroleptics with central depressant and cataleptic activity; the sedative effects reveal protraction in all cases. In the test of catalepsy the least active compound Ib shows, however, a clear prolongation of this effect. Compound Ia is the most active one in the test of antiapomorphine activity but its effects are not protracted.