Scheme 4.
Reactions and conditions: (a) anisole, HCl, 40 °C, 4 h, 74%; (b) Boc-aniline, HCl, 40 °C, 4 h, 43%; (c) BzCl, NEt3, DCM, r.t. 6 h, 69%; (d) Zn/HCl, 0 °C, 4 h, 43%; (e) benzene, HCl, 2 h, 18%.
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