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Synthesis of the ligands. i) 7, K2CO3, CuSO4*5H2O, MeOH, −20 °C to R.T., 4 h; ii) Ac2O, Py, RT, 12 h, 90 % over two steps; iii) MeNH2, THF, 0 °C–R.T., 5 h, 97 %; iv) Cl3CCN, DBU, CH2Cl2, 0 °C, 30 min, 79 %; v) 9, TMSOTf, CH2Cl2, −30 °C, 1 h, 95 %; vi) CuSO4⋅5 H2O, Na ascorbate, THF/water; vii) MeONa, MeOH, RT, 30 min.
