1: TsN3, Et3N / benzene / Ambient temperature 2: (i) CuI*P(OMe)3, hexafluorobenzene, (ii) O3, AcOEt, (iii) aq. H2O2, aq. HCl, AcOH View Scheme

(i) CuCl*P(OMe)3, (ii) O3, AcOEt, (iii) aq. H2O2, aq. HCl, AcOH; Multistep reaction;