The facile synthesis of 6- to 8-membered pyrrololactams has been developed using a ring expansion of spiro-2H-pyrroles, the products of intermolecular alkyne–isocyanide click reactions. The key to successful ring expansion of spiro-2H-pyrroles to pyrrololactams is the enforced orbital overlap between the internal alkene and the amide carbonyl group through the conformationally locked bicyclic structures
利用螺-2 H-
吡咯(分子间
炔烃-
异氰酸酯点击反应的产物)的扩环反应,可以轻松合成6至8元的
吡咯内酰胺。螺2 H-
吡咯成功扩环成
吡咯内酰胺的关键是内部烯烃和酰胺羰基之间通过构象锁定的双环结构之间的强制轨道重叠。新近公开的α-异
氰基内酰胺,点击反应的底物,应在合成重要的药学上重要的
杂环化合物中找到其效用。