Table 1 Optimization of the reaction conditions^a

DCE: 1,2-dichloroethane, DCM: dichloromethane, L: Ligand; N₃: high iodine azide reagent; 1a: azidobenziodoxolone, 1b: azidodimethylbenziodoxole; 1c–g: azidobenziodazolones.
^aReaction conditions: 2a (0.1 mmol), 1a (0.15 mmol), Cu(MeCN)₄PF₆ (10 mol%), L (12 mol %), solvent (2 mL), 25 °C; isolated yields; ee values were determined by HPLC analysis.
^b1b was used in place of 1a.
^cThe designated azidating reagent was used in place of 1a; 5 mol % of Cu(MeCN)₄PF₆ and 6 mol% of L8 were used instead.

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