Evidence for the reaction of nitrosocarbonyl compounds as heterodienes in the Diels–Alder reaction
作者:Donald Mackay、Kenneth N. Watson、Lê H. Dao
DOI:10.1039/c39770000702
日期:——
Evidence is given that a nitrosocarbonyl compound can react with a cyclic diene to give a 5,6-dihydro-1,4,2-dioxazine, not only by isomerisation of an initially formed 2-acyl-3,6-dihydro-1,2-oxazine, but also by reacting as a heterodiene directly with a π-bond in the cyclic diene; the role of the ring oxygen in retarding the isomerisation of an oxazine to a dioxazine is discussed.
有证据表明,亚硝基羰基化合物可以与环状二烯反应生成5,6-二氢-1,4,2-二恶嗪,不仅可以通过最初形成的2-酰基-3,6-二氢-1的异构化来实现, 2-恶嗪,但也可以作为杂二烯直接与环状二烯中的π键反应;讨论了环氧在阻止恶嗪向二恶嗪异构化中的作用。