Palladium-Mediated Intramolecular Formation of a C-S Bond: Application to the Selective Syntheses of Six- and Seven-Membered Sulfur-Containing Heterocycles
Cyclopalladated complexes derived from benzylmethyl sulfide, o-iodo sulfides, or methyl-2-biphenyl sulfide react with alkynes to give stable organometallic compounds whereby the alkyne has inserted in the carbon-palladium bond. Activation of these complexes was effected by treatment with a silver salt, and resulting thermolysis led to a selective depalladation process, affording a series of both neutral and cationic 1H-2S-benzothiopyran derivatives. With dissymmetric alkynes this reaction displayed a high degree of regiocontrol. Under similar conditions, a new entry for the synthesis of derivatives of the rare family of dibenzo[bd]thiepins was acheived.
Disulphide compounds of Formula (I) where Y is sulphuryl or sulphinyl Z is phenyl or substituted phenyl and the other variables are as defined in the claims; pharmaceutical compositions comprising these compounds and methods for making these compounds. These compounds are useful in therapeutic methods for treating microbial infection, inflammation and reducing the formation of blood clots and have non-therapeutic use as antimicrobial agents, anti-inflammatory agents and as anti-thrombotic agents.