Synthesis of 4-aryl-2-sulfenyl-2H-1-benzothiopyran derivatives by cyclization of [2-(1-aryl-2-methoxyvinyl)phenylthio][methyl(or phenyl)-thio]methyllithiums

Article abstract of DOI:10.1246/bcsj.79.1977

4-Aryl-2-methyl(or phenyl)thio-2H-1-benzothiopyrans have been prepared in satisfactory yields from the corresponding 1-(1-aryl-2-methoxyethenyl)-2- {[methyl(or phenyl) thiomethyl]thio}benzenes via lithiation of the carbon atom between the two sulfur atoms