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Reagents and conditions: (a) 4-ethynylbenzoic acid, HATU, DIPEA, DMF, pH 9.4 sodium borate buffer, rt, 2 h; (b) 14, copper(II) sulfate, sodium ascorbate, DMA, pH 9.4 sodium borate buffer, rt, o/n; (c) 10% v/v piperidine, rt, 1 h.
