Generation and metathesis of azomethine imines in reaction of 6-aryl-1,5-diazabicyclo[3.1.0]hexanes with het(aryl)methylidenemalononitriles
作者:M. I. Pleshchev、V. Yu. Petukhova、V. V. Kuznetsov、D. V. Khakimov、T. S. Pivina、Yu. V. Nelyubina、N. N. Makhova
DOI:10.1007/s11172-013-0143-9
日期:2013.4
give in situ new azomethine imines inaccessible by common synthetic methods. New azomethine imines are detected as pyrazolines formed via a 1,4-H shift and trapped by the [3+2] cycloaddition with various dipolarophiles to yield 1,5-diazabicyclo[3.3.0]octane derivatives bearing pharmacophoric heterocycles, e.g. furan, nitrofuran, thiophene, and indole. The best results are achieved in the Et2O·BF3-catalyzed
发现了偶氮甲碱亚胺的新复分解反应。6-芳基-1,5-二氮杂双环[3.1.0]己烷的催化或热二氮丙啶开环导致偶氮甲亚胺与杂(芳基)亚甲基丙二腈进一步反应,原位生成新的偶氮甲亚胺,这是普通合成方法无法获得的。新的偶氮甲碱亚胺被检测为通过 1,4-H 位移形成的吡唑啉,并通过 [3+2] 环加成与各种偶极试剂捕获,产生带有药效杂环的 1,5-二氮杂双环 [3.3.0] 辛烷衍生物,例如呋喃,硝基呋喃、噻吩和吲哚。在 Et2O·BF3 催化的离子液体反应中取得了最好的结果。