Oxidative [3+2] Cycloaddition Reactions of 1,3-Dicarbonyl Compounds to Exocyclic Alkenes: The Regiospecific Synthesis of Spirodihydrofurans - Muthusamy, Sengodagounder; Gunanathan, Chidambaram; Babu, Srinivasarao Arulananda (Synlett, 2002)