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Synthesis of ring C modified GA derivatives 113–115. Reagents and conditions: (a) Zinc dust, conc. HCl, dioxane, 25 °C, 24 h; (b) MeI, K2CO3, DMF, 25 °C, 24 h; (c) BH3-THF, THF, citric acid, 25 °C, 20 h; (d) EtI, K2CO3, DMF, 25 °C, 24 h; (e) BH3-THF, THF, Na2CO3, 25 °C, 4 days.
