An efficient one-pot synthesis of 1,2-dihydro-2-oxo-3-pyridinecarboxylate derivatives starting from enones and ethyl cyanoacetate in moderate to good yields is described. This novel tandem [3+3] annulation method mediated by FeCl3 involves Michael addition and ketone-nitrile annulation followed by aromatization-dehydrogenation. A plausible mechanism is also proposed.
描述了一种高效的一锅合成1,2-二氢-2-氧代-3-
吡啶甲酸酯衍
生物的方法,起始原料为烯酮和乙基
氰乙酸酯,产率在中等到良好之间。该新颖的串联[3+3]环化反应由FeCl3催化,涉及迈克尔加成和酮-腈环化,随后进行芳构化脱氢。还提出了一种合理的机制。