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Synthetic approaches to diaryl oxazoles. a, N-bromosuccinimide, trimethylsilyl trifluoromethanesulfonate. b, NaN3, DMSO, 30 min rt. c, PPh3, TsOH, tetrahydrofuran, 24 h. d, EDC, DIEA, DCM. e, POCl3/DMF (1:5), 80°C, 2 h. f, Ar-B(OH)2, Pd(PPh3)4, Na2CO3, DME/H2O (3:1), reflux, 2 h.
