Scheme 4.
Reagents and conditions: (a) (i) Pd(PPh3)4, 2 M aqueous K2CO3, EtOH, reflux, (ii) HCl, H2O. (b) K2CO3, DMF, 80 °C. (c) 1,4-benzoquinone, DMF, EtOH, reflux.
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