An Efficient and Convenient Synthesis of 4-Vinylimidazoles Using a Novel Horner-Wadsworth-Emmons (HWE) Reagent: Synthetic Studies Toward Novel Histamine H3-Ligands
A novel Horner-Wadsworth-Emmons (HWE)-type reagent 1 reacted readily with various aldehydes and ketones to produce (E)-vinylimidazoles 2 in good yields. The synthetic utility of 1 was demonstrated by the efficient preparation of four histamine H 3 ligands 3 by simple hydrogenation of 2.