Aryl-substituted epoxides react with aqueous sodium azide to form a-azidohydrins, NOT B-azidohydrins. This is according to the following journal references:
JOC, 1999, 64, 6094-6096
"Ring Opening of Epoxides with Sodium Azide in Water. A Regioselective pH-Controlled Reaction"
JOC, 1993, 58, 2663-2669
"Acid-Catalyzed Hydrolysis of cis- and trans-Anethole Oxides: Discrete Carbocation Intermediates and Syn/Anti Hydration Ratios"
Thank you