Collect. Czech. Chem. Commun. 1985, 50, 1484-1497

Butaclamol-like neuroleptic agents: Synthesis of 1-(11H-dibenz[b,f]-1,4-oxathiepin-11-yl)methyl-4-isobutylpiperidin-4-ol and of some related compounds

Karel Šindelář, Jiří Holubek, Emil Svátek, Miroslav Ryska, Martin Valchář and Miroslav Protiva

Research Institute for Pharmacy and Biochemistry, 130 60 Prague 3


1-(11H-Dibenz[b,f]-1,4-oxathiepin-11-yl)methyl-4-piperidone (XIII), which was obtained from 11H-dibenz[b,f]-1,4-oxathiepin-11-carboxylic acid (VIII) in four steps, was treated with isobutylmagnesium bromide and gave the title compound V in addition to the prevailing quantity of the secondary alcohol VI, i.e. the product of reduction. Synthesis of a series of trisubstituted benzyl phenyl sulfide derivatives XVIII-XXIV, XXVI-XXXI is described; these compounds are potential intermediates in the preparation of 11H-dibenz[b,f]-1,4-oxathiepinacetic acids XVI and XVII. Chloromethylation of 11H-dibenz[b,f]-1,4-oxathiepin (VII) and two further usual steps gave an acid to which structure XVI is assigned. Compound V is an open model of "oxathiaisobutaclamol" and in agreement with this fact it behaves like a neuroleptic agent: it increases the turnover and metabolism of dopamine in the rat brain striatum which is manifested by a significant rise of homovanillic acid level.