Catalytic Enantiospecific [3+2] Annulation of Aminocyclopropanes with Ketones

The first enantiospecific [3+2] annulation of D-A amino-cyclopropanes with ketones is reported herein (see scheme; Phth = phthaloyl). The reaction is catalyzed by 5 mol % of tin(IV) chloride at -78 °C and gives aminotetra-hydrofurans bearing a C5-quaternary stereocenter in high yield, diastereoselectivity and enantio-specificity.