Scheme 1.
Synthesis of ZnTEP. Reagents and conditons: (a) BF3.OEt2, DCM, r.t., 3 h; (b) DDQ, DCM, r. t., 2 h, 34%; (c) Zn(CH3COO)2, DCM/MeOH, 18 h, 98%.
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