challenge. A simple copper-catalyzed strategy for synthesizing C-substituted piperazinones is described, employing easily accessible diazo compounds and 1,2-diamines. The reaction proceeded via chemo-selective carbene insertion at the comparatively less nucleophilic amine, followed by instantaneous cyclization. The protocol was further extended to access NH-free piperazinone, and the synthesis of a Mianserin
将不对称二胺
化学选择性 N-H 插入卡宾是一个长期存在的挑战。描述了一种简单的
铜催化合成C-取代
哌嗪酮的策略,使用容易获得的重氮化合物和 1,2-二胺。该反应通过
化学选择性卡宾插入亲核性相对较低的胺进行,然后瞬时环化。该方案进一步扩展以获取不含 NH 的
哌嗪酮,并合成
米安色林衍
生物。