[CH3:1][C:2]1([CH3:14])[C:6]([CH3:8])([CH3:7])[O:5][B:4]([C:9]2[CH:10]=[N:11][NH:12][CH:13]=2)[O:3]1.Cl[CH:16]([CH3:19])[C:17]#[N:18].C(=O)([O-])[O-].[Cs+].[Cs+]>C(#N)C.O>[CH3:1][C:2]1([CH3:14])[C:6]([CH3:7])([CH3:8])[O:5][B:4]([C:9]2[CH:13]=[N:12][N:11]([CH:16]([CH3:19])[C:17]#[N:18])[CH:10]=2)[O:3]1
A mixture of 4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazole (Aldrich, Cat. No. 525057)(0.22 g, 1.1 mmol), 2-chloropropanenitrile (Aldrich, Cat. No. 192406) (0.12 g, 1.4 mmol), and cesium carbonate (0.82 g, 2.5 mmol) in acetonitrile (4.0 mL) was stirred at 80° C. for 2 h. The reaction mixture was diluted with water, extracted with ethyl acetate, washed with brine. The combined organic layers were dried over MgSO4, filtered and concentrated under reduced pressure. The residue was purified by flash chromatography on a silica gel column with ethyl acetate in hexanes (0-40%) to afford the desired product. LCMS (M+H)+=248.1.
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