Abstract 4-Methoxy-2-(phenylthio) benzoic acid (V) was transformed in four steps to the homologous acid IXa which was cyclized to 3-methoxydibenzo [b, f] thiepin-10 (11H)-one (Xa). The 3-methoxy derivative III of perathiepin (I) was synthesized via the intermediates XIa and XIIa, and demethylated with boron tribromide to the phenolic compound II. The analogous 3-fluoro derivative IV was synthesized from (4-fluoro-2-iodophenyl) acetic acid ...
