Thermal rearrangement of N-arylmethyl- and N-alkyl-2,2-dihalogenocyclopropyl imines
作者:Shinto Kagabu、Chihaya Ando、Junko Ando
DOI:10.1039/p19940000739
日期:——
temperatures. An ionic mechanism triggered by the halide ion dissociation is proposed for the thermal rearrangement on the basis of a study using deuteriated imine 15m, and the effects of additives and solvents. On the other hand, difluorocyclopropyl imine undergoes a homolytic cleavage of cyclopropane 1,3-bond with lower activation energy than the dichlorocyclopropyl imine, and afforded the N-alkyl-3-fluoropyrrole
据报道,对1-取代的2,2-二卤代环丙基亚胺进行热异构化的扩展研究。的热解Ñ -arylmethyl -2,2- dichlorocyclopropanecarbaldimines 15A - ħ产生2-芳基- 16A - ħ和2-芳基-4-氯-吡啶衍生物17A - ħ,而Ñ -alkylcyclopropyl亚胺15I,Ĵ收率Ñ -alkylchloropyrroles 。2,2-二溴环丙烷类似物在较低温度下进行热解。在使用氘化亚胺的研究的基础上,提出了由卤化物离子解离引发的离子机理用于热重排。15m,以及添加剂和溶剂的影响。另一方面,二氟环丙基亚胺以比二氯环丙基亚胺低的活化能进行环丙烷1,3-键的均相裂解,优先得到N-烷基-3-氟吡咯衍生物。