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Synthesis of TAU3, TAU6-8, and the precursor of T807. i = Pd(dppf)Cl2/Na2CO3, ACN, 80°C, 16 h, ii = Pd(PPh3)4/K2CO3, dioxane:water (1:1), 90°C, 16 h, iii = P(OEt)3, 100°C, 3 h, iv = phosphorus pentoxide/methanesulfonic acid (PPMA), 100°C, 1 h.
