Sonogashira cross-coupling of (Z)-2‑bromo-2-CF3-vinyl benzyl sulfide and access to 4-CF3-3-iodo-2-substituted thiophenes

Abstract

The Sonogashira cross-coupling reaction of (Z)-2‑bromo-2-CF3-vinyl benzyl sulfide with various terminal acetylenes afforded the corresponding (E)-2-CF3-1-buten-3-ynyl benzyl sulfides in good to high yields. Subsequent iodocyclization afforded the corresponding 4-CF3-3-iodo-2-substituted thiophenes in good to high yields.