ring expansion was developed. Azirinyl-substituted diazodicarbonyl compounds, prepared from diazoacetylazirines, were converted in excellent yields to 2-hydroxy-3-oxo-2,3-dihydro-1H-pyrrole-2-carboxylates under Rh catalysis in the presence of water. According to DFT calculations, the formation of only pyrrolinone derivatives and the absence of O–H insertion products of Rh carbene into water are due
开发了用于分子内
氮丙啶环扩展的重氮策略。Azirinyl 取代的 diazodicarbonyl 化合物,从 diazoacetylazirines 制备,转化为 2-hydroxy-3-oxo-2,3-dihydro-1 H -pyrrole-2-carboxylates 在 Rh 催化下在
水的存在下以优异的收率。根据 DFT 计算,Rh 卡宾在
水中仅形成
吡咯啉酮衍
生物且不存在 O-H 插入产物,这是由于
氮丙啶环协同打开和再循环生成
吡咯酮的过渡态吉布斯自由能较低中间 Rh 配合物。