Scheme 2.
Synthesis of Group II Azide Precursors, 2-(3-Azidophenyl)-4,5-Diphenyloxazoles 18-21. Reagents/Conditions: (a) DMAP/CH2Cl2/5 °C to rt/16 h; (b) NH4OAc/HOAc/115 °C/3 h.
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