4-e]azepin-1-ones starting from N-propargyl arylamines having a pendant α,β-unsaturated ester scaffold. The mechanism of this sequential process involved intramolecular syn-oxypalladation followed by olefin insertion and ortho sp2-C–Cl bond formation reactions. This high atom- and step-economical cascade sequence generated two heterocycle rings and three new bonds in a single synthetic operation.
建立了一种有效的Pd(II)催化级联方法,用于从具有侧链α的N-炔丙基芳基胺开始合成9-
氯-1 H-苯并[ b ]
呋喃[3,4- e ]氮杂-1-酮,β-不饱和酯支架。该顺序过程的机制涉及分子内的顺氧基palpalation,随后的烯烃插入和邻位sp 2 -C-Cl键形成反应。这种高原子和步长经济的级联序列在一次合成操作中产生了两个杂环和三个新键。