Water → 5-Cyclopropyl-6-(1-hydroxy-1,3-dihydrobenzo[c][1,2]oxaborol-5-yloxy)-2-(4-oxopentyloxy)nicotinonitrile

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A mixture of 6-chloro-5-cyclopropyl-2-(4-oxopentyloxy)nicotinonitrile (360 mg, 1.29 mmol), compound benzo[c][1,2]oxaborole-1,5(3H)-diol (232 mg, 1.55 mmol) and Cs2CO3 (505 mg, 1.55 mmol) in DMSO (20 mL) was stirred at 40° C. overnight. The mixture was diluted by water, extracted by EtOAc, the separated organic layer was concentrated in vacuo and the residue was purified by column chromatography (Petroleum ether:EtOAc=10:1˜3:1) to afford 5-cyclopropyl-6-(1-hydroxy-1,3-dihydrobenzo[c][1,2]oxaborol-5-yloxy)-2-(4-oxopentyloxy)nicotinonitrile. (200 mg, 40%). 1H-NMR (400 MHz, DMSO-d6) δ (ppm) 9.20 (s, 1H), 7.86 (s, 1H), 7.75 (d, J=8.0, 1H), 7.24 (d, J=2.0, 1H), 7.16 (dd, J=8.0, 2.0, 1H), 4.97 (s, 2H), 3.94 (t, J=7.8, 2H), 3.29 (t, J=7.8, 2H), 2.02 (m, 4H), 1.65 (t, J=7.8, 2H), 0.92 (m, 2H), 0.77 (m, 2H).

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