Scheme 2. Synthetic Strategy to Prepare G-CPD and OG-CPD.
Reagents and conditions: (i) H2SO4, MeOH, 100 °C, 24 h; (ii) acetone/MeCN, hυ, λ > 290 nm, 72 h; (iii) 5 M HCl, 100 °C, 30 min; (iv) 2 or 4, EDC, TBTU, DMAP, DMF, rt, 24 h.
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