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(i) DMAP, EDCI, CH2Cl2, room temperature, 24 h; (ii) silica gel column chromatography and recrystallisation from ethyl acetate/n-hexane 30:70; (iii) i-PrOH, 2.5 N NaOH, reflux, overnight; (iv) Phenylboronic acid, Cs2CO3, Pd[(C6H5)3P]4, anhydrous toluene, reflux, 8 h.
