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Synthesis of monomer 2. Conditions: a) 15 mol% Ni(OTf)2, 8, CH2Cl2, 35 °C, 12 h, 79%, α only; b) NaOMe, MeOH; c) HCl, acetone; d) SO3.Me3N, Et3N, DMF, 55 °C, 65%, 3 steps; e) DDQ, PBS/CH2Cl2, 75%; f) scaffold A, CuI, DBU, DMF, 50 °C, 64%; g) LiOH, THF/H2O, 94%.
