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Reagents and conditions: (a) MsCl, Et3N, DCM; (b) NaN3, 15-crown-5, DMF, 90 °C; (c) CuSO4, sodium ascorbate, t-BuOH/H2O; (d) HCl, DCM/MeOH; (e) 1-bromonaphthalene, NaOtBu, BrettPhos Pd G1, dioxane, 60 °C; (f) 1-isocyanatonaphthalene, Et3N, DCE; (g) 1-naphthoyl chloride, TEA, DCE.
