Iron-Catalyzed Synthesis of Polyfunctional Pyridines from Ketoxime Carboxylates and Nitrones

摘要

Polyfunctional pyridines are backbone of numerous natural products and pharmaceutical reactive intermediates. We have developed an iron-catalyzed cyclization reaction between ketoxime carboxylates and nitrones to afford trisubstituted pyridines. Employing this strategy, we have synthesized a number of trisubstituted pyridines with various functional groups in good yields under simple reaction conditions. It is worth mentioning that the nitrones can serve as a novel C1 unit in organic synthesis.