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. 2021 Mar 3;27(19):6077–6085. doi: 10.1002/chem.202005276

Scheme 1.

Scheme 1

Modular synthesis of diboronic acid CPhCOOH: i) BF3⋅OEt2, 100 °C, 2 h, 38 %; [27] ii) 4 [29] /NaOH, MeOH, 30 min, then Ac2O, 160 °C, 2 h, 55 %; [28] iii) B2pin2/KOAc/Pd(dppf)Cl2, DMF, reflux, 2.5 h, 71 %; iv) BBr3, CH2Cl2, 0 °C→rt, 3.75 h, 76 %.