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Synthetic procedure for the preparation of 1a,b. Reagents and conditions: (a) MeOH, conc. H2SO4, reflux, overnight; (b) Pd(PPh3)2Cl2, 2 M Na2CO3, dry 1,4-dioxane, 90 °C, overnight, N2 atm; (c) 1. LiOH, THF-H2O 2:1, r.t., 2 h for 1a; 1 M NaOH, EtOH-THF 1:1, reflux, 5 h for 1b; 2. 1 M HCl, 0 °C.
