Scheme 4. Scope of alkyl-substituted sulfoxonium ylides. a Reaction conditions: 1a (0.1 mmol), 4a–4q (2.0 equiv.), RhCp*(OAc)2·H2O (6 mol%), HFIP (1.0 mL), 100 °C, 30 min, Ar atmosphere. b Isolated yield. c 12 h. d Sulfoxonium ylide was used as a racemic mixture. e no d.r. was determined. f 1 mmol scale. g 48 h. h 3 h. i Enantiopure 4p was used.
