Scheme 2.
Reagents and conditions: i) TMSOTf, DCM, 2 h at −20 °C; ii) 0.1 mol L−1 NaOMe/MeOH, 1 h at r.t.; iii) 1: Me3P, toluene, water, dioxane, 4 h at r.t. under N2, 2: conc. ammonia, overnight at r.t.
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