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Reagents and conditions: (a) Eaton’s reagent (7.7 wt % P2O5 solution in MeSO3H), 80 °C; (b) Tf2O, pyridine, DCM, 0 °C; (c) NaH (60%), PivCl, THF; (d) Pd(OAc)2, BINAP, diphenylmethanimine, Cs2CO3, dioxane, reflux; (e) HCl, THF, H2O, r.t.; (f) RSO2Cl, pyridine, r.t.; (g) NaOH, MeOH, H2O, r.t.
