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Reagents and conditions: (a) NaH, THF, 0 °C, 15 min; (b) SEMCl, 0 °C, 1 h; (c) 2-methoxy-5-methyl-phenylboronic acid, Pd(dppf)Cl2, K2CO3, dioxane, H2O, N2, 100 °C, 3 h; (d) sodium 4-(tert-butyl)benzenesulfinate, CuI, DMF, N2, 65 °C, 18 h; (e) TBAF, THF, N2, 60 °C, 2 h.
