Reductive rearrangement of 5-nitrobicyclo[2.2.1]hept-2-enes. Formation of 3-arylpyridines
摘要:
Treatment of 6-aryl-5-nitrobicyclo[2.2.1]hept-2-enes with tin(II) chloride in refluxing THF or dioxane gave 3-arylpyridines via a deep-seated rearrangement.
E‐2‐arylnitroethenes, their [4 + 2] cycloadditionreactions with cyclopentadiene leads to the corresponding 6‐endo‐aryl‐5‐exo‐nitronorbornenes and 6‐exo‐aryl‐5‐endo‐nitronorbornenes as the only reaction products. Stereoselectivity, substituent and solvent effects, and activation parameters, suggest that these reactions occur via a synchronous concerted mechanism on both competing pathways. The experimental