(Z)-Prop-1-en-1-ylboronic acid → HCID 178439564, 화합물

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A scintillation vial equipped with a stirbar was charged with (S)-6-bromo-1-(1-phenylethyl)-1H-imidazo[4,5-b]pyrazin-2-ol (1.0 equiv), (Z)-prop-1-enyl boronic acid (2.0 equiv) and (DPPF)PdCl2 (0.10 equiv). The vial was fitted with a septum-lined cap and purged with nitrogen for 5-10 min. To this mixture was added dioxane (16.6 volume equivalents) and degassed 2N K2CO3 (4.2 volume equivalents) by syringe. The resulting mixture was heated to 90° C. overnight. The mixture was cooled to room temperature, diluted with EtOAc, washed with twice with saturated aq. NaHCO3, and once with brine. The organic layer was dried over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Biotage MPLC 5%-40% EtOAc/Hexanes) provided the title compound (63%) as an off-white foam. LCMS m/z (APCI)=281.1 (M+H).

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