Cesium carbonate → 2-methyl-1-[4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazol-1-yl]propan-2-ol

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Reaction Conditions

Reaction Steps

A mixture of 4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazole (1.5 g, 7.73 mmol) and cesium carbonate (0.499 g, 1.34 mmol) in isobutylene oxide (15 mL) was heated to 120° C. under microwave irradiation for 30 minutes. It was cooled to r.t., filtered and concentrated in vacuo to give the title compound (1.79 g, 87%) as a cream solid. δH (CDCl3) 1.15 (6H, s), 1.33 (12H, s), 3.97 (1H, s), 4.07 (2H, s), 7.69 (1H, s), 7.82 (1H, s). LCMS (ES+) 269/269 (M+H)+.

Provenance & Evidence