3‐c]pyrazol‐4(1H)‐ones is reported. In this atom economic process, readily available 3‐acylcoumarin hydrazone is oxidative cyclized by direct C–N bond formation. Air has been successfully used as an oxidant, which has important economic and environmental advantages. A broad scope of 3‐acylcoumarin hydrazones can be utilized in this process.
据报道,高效,便捷的Cu催化形成了
铬诺[4,3 - c ]
吡唑-4(1 H)-酮。在这个原子经济过程中,容易获得的3酰基
香豆素通过直接的C–N键形成而被氧化环化。空气已成功地用作氧化剂,具有重要的经济和环境优势。在此过程中,可以使用各种3-酰基
香豆素。