Nitroacetylene equivalents. Preparation and cycloadditions of 2-phenylsulphinyl-1-nitroalkenes
Abstract
β-Phenylsulphinyl-nitro-alkenes (7) are readily prepared from acyl imidazoles and react as nitroacetylene equivalents in Diels–Alder reactions to give good yields of cycloadducts and their further products.