aReagents and conditions: (a) 2-benzofuranylboronic acid, KOH, Na2PdCl4, H2O, 100 °C, μW, 1 h; (b) (t-Bu)2Si(OTf)2, imidazole, DMF, 0 °C, 1.3 h; (c) TBDMS-Cl, imidazole, DMF, 60 °C, 1 h; (d) HF-pyridine, pyridine, CH2Cl2, −10 °C, 2 h; (e) DMT-Cl, pyridine, 0 °C, 6 h; (f) 2-cyanoethyl N,N,N′,N′-tetraisopropyl phosphorodiamidite, 5-(ethylthio)-1H-tetrazole, CH2Cl2, 65 °C, μW, 1 h.