Herein, we report a metal-free synthesis of cyclic amidines, oxazines, and an oxazinone under mild conditions by electrophilic amide activation. This strategy features an unusual Umpolung cyclization mode and enables the smooth union of α-aryl amides and diverse alkylazides, effectively rerouting our previously reported α-amination transform.
The acid-catalysed decomposition of some β-azido-carbonyl compounds
作者:A. J. Davies、A. S. R. Donald、R. E. Marks
DOI:10.1039/j39670002109
日期:——
of ammonia with pyruvaldehyde, biacetyl, and pentane-2,3-dione, respectively, through the intermediate formation of β-azidocarbonyl compounds. For methyl isopropenyl ketone and mesityl oxide neither the Schmidt reaction of the ketone nor the acid-catalyseddecomposition of the β-azido-ketone leads to similar products.
Domino ‘Staudinger–aza-Wittig–1,5-phosphonium-rearrangement–fragmentation’ reactions of 1-azido-2-hydroxy-4,6-dioxohexanes
作者:Peter Langer、Ilia Freifeld、Heydar Shojaei
DOI:10.1039/b310701a
日期:——
The domino âStaudingerâaza-Wittigâ1,5-phosphonium-rearrangementâfragmentationâ reaction of 1-azido-2-hydroxy-4,6-dioxohexanes allows a convenient synthesis of functionalized 1-acetamido-2-alkylidenecyclopentanes.
Synthesis of 2-Alkylidenepyrrolidines and Pyrroles by Condensation of 1,3-Dicarbonyl Dianions with α-Azidoketones and Subsequent Intramolecular Staudinger−Aza-Wittig Reaction
作者:Ilia Freifeld、Heydar Shojaei、Peter Langer
DOI:10.1021/jo060593h
日期:2006.6.1
The condensation of 1,3-dicarbonyl dianions with α-azidoketones afforded open-chained condensation products that were transformed into pyrroles by Staudinger−aza-Wittig reactions and the subsequent treatment with trifluoroacetic acid.
Efficient and regioselective synthesis of functionalized pyrroles by cyclocondensation of 1,3-dicarbonyl dianions with α-azidoketones
作者:Peter Langer、Ilia Freifeld
DOI:10.1039/b207840f
日期:——
The cyclocondensation of 1,3-dicarbonyl dianions with α-azidoketones regioselectively afforded 2-alkylidenepyrrolidines which were transformed into functionalized pyrroles by treatment with acid.