(4Z)-Methyl 2-Acetyl-4-Chloro-5-(Dimethylamino)Penta-2,4-Dienoate置于ammonium Acetate体系中,用 四氢呋喃 作为反应溶剂,化学反应 6.0H,以95%的收率获得产物5-氯-2-甲基-3-吡啶羧酸甲酯
参考文献:A General Preparation Of Pyridines And Pyridones Via The Annulation Of Ketones And Esters
标题:A General Preparation Of Pyridines And Pyridones Via The Annulation Of Ketones And Esters
摘要:A General Preparation Of Pyridines 4A-F From Stabilized Ketones 3A-C And Aryl Ketones 3D-F Is Described. The Annulation Of Stabilized Esters 3G,H Gives Access To The Corresponding 2-Pyridones 4G,H. The Annulation Reactions Proceed In Fair To Excellent Yields (46-87%) With Vinamidinium Hexafluorophosphate Salts 2A-D Containing Electron-Withdrawing Groups At The Beta-Positisn. The Mechanism Of The Reaction Was Investigated By NMR And Proceeds Through The Formation Of A Dienaminone Intermediate.
DOI:10.1021/jo0155198