Synthesis of indenothiophenone derivatives by cycloaromatization of non-conjugated thienyl tetraynes

Article abstract of DOI:10.1016/j.tetlet.2005.01.005

Non-conjugated thienyl tetrayne derivatives 1-3 are prepared as novel building block for the construction of indenothiophenone derivatives. Oxidation of 1-3, followed by cycloaromatization of the corresponding ketone derivatives 13-15 proceeds smoothly to afford indenothiophenone derivatives 16-21 in good yields.