SCHEME 1.
Synthetic route for the complexes 1 and 2: (i) TMSN3, SnCl4, DCM, rt, 16 h, 91%; (ii) CuSO4, sodium ascorbate, t-BuOH, THF, H2O, rt, 16 h, 64%; (iii) EDCI, NHS, DCM, rt, 16 h, 77%; (iv) DMSO, 60°C, 16 h, 43%.
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