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Synthesis of compounds 3a–j.
Reagents and conditions: (a) RSO2Cl/Et3N, CH2Cl2, 0 °C-r.t., 1 h; (b) CH2 = C(OCH3)CH3, PPTs, toluene, 85 °C, 2 h; (c) LiOH, THF/H2O, r.t., 1 h; (d) 7,10-ditroc-10-DAB, DCC, DMAP, toluene; 85 °C, 3 h; (e) HCOOH, r.t., 1.5 h; (f) Zn/HOAc, MeOH, 50 °C, 1 h.
