Four heteroatoms dance in the cascade of four pericyclic reactions initiated by ozonolysis of C═N bonds. Switching from imines to semicarbazones introduces the fifth heteroatom that slows this dance, delays reaching the thermodynamically favorable escape path, and allows efficient interception of carbonyl oxides (Criegee intermediates, CIs) by an external nucleophile. The new three-component reaction
四个杂原子在由 C=N 键
臭氧分解引发的四个周环反应的级联中起舞。从
亚胺切换到缩
氨基
脲引入了第五个杂原子,它减缓了这种舞蹈,延迟了到达热力学上有利的逃逸路径,并允许外部亲核试剂有效拦截羰基氧化物(Criegee中间体,CI)。醇、
臭氧和
肟/缩
氨基
脲的新型三组分反应极大地促进了单过氧
缩醛(烷氧基氢过氧化物)的合成。