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(a) Pd(PPh3)4, CuI, 4-ethynylanisole, NEt3, DMF, 80 °C, 20 h; (b) 4-methoxybenzenesulfonyl chloride, pyridine, rt, 18 h; (c) 5 wt % Pd/C, H2 (40 psi), EtOAc, rt, 18 h; (d) ethyl bromoacetate, K2CO3, MeCN, rt, 18 h; (e) 15% NaOH(aq), MeOH, rt, 5 h.
