Get in the ring! The first examples of transition‐metal‐catalysed CC bond activation of 3‐azetidinones and 3‐oxetanones are reported. In the presence of a nickel catalyst and alkynes, a regioselective and high‐yielding [4+2] cycloaddition occurs, leading to the formation of pyridinones, pyranones and eventually 4,5‐disubstituted 3‐hydroxypyridines (see scheme).
加油!过渡
金属催化的C的第一实施例报道C键活化的3-氮杂
环丁酮和3-氧杂
环丁烷酮。在
镍催化剂和
炔烃的存在下,会发生区域选择性和高产率的[4 + 2]环加成反应,导致形成
吡啶酮,
吡喃酮,并最终形成4,5-二取代的3-
羟基吡啶(参见方案)。