An oxygen-mediated annulation reaction has been reported herein. Various 3-hetero-substituted isocoumarins were successfully prepared with high efficiency (yields up to 88 %) and good functional-group tolerance (35 examples) in the presence of a rhodium catalyst. A plausible mechanism has also been proposed that shows the high regioselectivity mostly likely originates from the electron-density difference
本文已经报道了氧介导的环化反应。在
铑催化剂的存在下,成功地制备了各种 3-杂取代异
香豆素,具有高效率(产率高达 88%)和良好的官能团耐受性(35 个例子)。还提出了一种可能的机制,表明高区域选择性很可能源于底物的炔基碳原子之间的电子密度差异。