(4,4-Dimethyl-2-oxo-1,4-dihydro-2H-3,1-benzoxazin-6-yl)boronic acid → 4-(4,4-Dimethyl-2-oxo-1,4-dihydro-2H-benzo[d][1,3]oxazin-6-yl)-furan-2-carbonitrile

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4-(4,4-Dimethyl-2-oxo-1,4-dihydro-2H-benzo[d][1,3]oxazin-6-yl)-furan-2-carbonitrile was prepared from (1,4-dihydro-4,4-dimethyl-2-oxo-2H-3,1-benzoxazin-6-yl)boronic acid and 4-bromo-2-furancarbonitrile according to Procedure B. Off-white solid: mp 255-256° C. 1H-NMR (DMSO-d6) δ 10.32 (s, 1H, D2O exchangeable), 8.57 (s, 1H), 8.15 (s, 1H), 7.61 (s, 1H), 7.55 (dd, 1H, J=8.3, 1.5 Hz), 6.92 (d, 1H, J=8.2 Hz), 1.65 (s, 6H); MS (ESI) m/z 269 (M+H, 72%). Anal. Calcd. For C15H12N2O3: C, 67.16, H, 4.51; N, 10.44. Found: C, 67.14, H, 4.59; N, 10.07.

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