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A solution of 4-[4-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)-pyrazol-1-yl]-piperidine hydrochloride (3.66 g, 11.7 mmol) in DMF (109.8 mL) was charged with acetyl chloride (0.91 mL, 12.84 mmol) and DIPEA (5.08 mL, 29.17 mmol) at 0° C. and left to warm up to RT in an ice bath overnight. The crude product was concentrated in vacuo to a solid and purified by flash chromatography (0 to 5% MeOH:EtOAc) to afford 3.71 g (99%) of the title compound. 1H NMR (400 MHz, DMSO-d6): δ 7.97 (s, 1H), 7.59 (s, 1H), 4.38-4.48 (m, 2H), 3.85-3.94 (m, 1H), 3.13-3.22 (m, 1H), 2.69 (td, J=12.8, 2.7 Hz, 1H), 2.03 (s, 3H), 1.81-2.02 (m, 3H), 1.72 (qd, J=12.1, 4.6 Hz, 1H), 1.24 (s, 12H).

1. waitleft
2. concentrationThe crude product was concentrated in vacuo to a solid
3. custompurified by flash chromatography (0 to 5% MeOH:EtOAc)