Synthesis of 4-Ethoxy-2, 3-dihydropyridinium Tetrafluoroborate Salts and 4-Ethoxy-2, 3-dihydropyridines

TN Jones, CK McClure

Index: Jones, T. Nicholas; McClure, Cynthia K. Synlett, 2009 , # 8 p. 1289 - 1290

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Abstract

Preparation of 4-ethoxy-2,3-dihydropyridinium salts 3a,c,d [6] was accomplished in high conversion utilizing ethyl Meerwein's reagent [7] as determined by ¹ H NMR analysis. In situ identification of the 4-ethoxy-2,3-dihydropyridinium tetrafluoroborate salts was accomplished via ¹ H NMR spectroscopy. Central to the identification of the dihydropyridinium salts was the ¹ H NMR signal representing the vinylic proton H a (Table [¹] ). The 4-ethoxy-2,3-dihydropyridinium salts 3 ...