Abstract
Reactions of but-3-en-1-ylphosphonate with α-nitroalkenes followed by the addition of trimethylchlorosilane led to the stereoselective synthesis of 6-substituted 3,3a,4,5,6-pentahydrocyclopent[c]-isoxazole-5-ylphosphonates via intramolecular silyl nitronate-olefin cycloadditions by a one-pot procedure.