General synthetic route. Reagents and conditions: (a) SOCl2, MeOH, 0 °C → reflux. (b) BTFFH, DIPEA, ArCOOH, DCM, 80 °C. (c) ArB(OH)2, Pd-XPhos-G4, 0.5 M K3PO4aq, THF, room temp. (d) For R” = OH: K2CO3, alkylhalide/tosylate, MeCN, 50–55 °C. (e) 0.6 M LiOHaq, THF, room temp.