Ti/Zn-mediated McMurry coupling of a series of 4-oxo-4H-chromene-2-carbaldehydes afforded unusual chemoselective CH2–CH2 tethered bis-chromones. Studying the reaction parameters and reagents further confirmed that the formation of unexpected coupled products is selective to 4-oxo-4H-chromene-2-carbaldehydes. This methodology demonstrated a simple and efficient route for the synthesis of bis-chromones
Ti / Zn介导的一系列4-oxo-4 H -chromene-2-carbaldehydes的McMurry偶联提供了不同寻常的
化学选择性CH 2 -CH 2系双
色酮。对反应参数和试剂的研究进一步证实,出乎意料的偶联产物的形成对4-氧代-4 H-亚甲基-2-甲醛具有选择性。该方法论证明了合成双
色酮的简单有效途径。