Scheme 7.
Synthesis of compounds 1 and 2. Reagents and conditions: [a] 0.1 % TFA in H2O/CH3CN, 37 °C, 30 min; [b] CuSO4 (1.5 equiv), Na ascorbate (15 equiv), THPTA (8 equiv), PBS (pH 7.4, 10 mm), r.t., 90 min.
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