반응 #2371690

반응 방정식

water

6-chloro-5-cyclopropyl-2-(2-isopropoxyethoxy)nicotinonitrile

benzo[c][1,2]oxaborole-1,5(3H)-diol

Cs2CO3

→

5-cyclopropyl-6-(1-hydroxy-1,3-dihydrobenzo[c][1,2]oxaborol-5-yloxy)-2-(2-isopropoxyethoxy)nicotinonitrile

용매

DMSO

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후처리

1. 1
   추출extracted by EtOAc
2. 2
   농축the separated organic layer was concentrated in vacuo
3. 3
   기타the residue was purified by column chromatography (Petroleum ether:EtOAc=10:1˜1:1)

실험 절차

A mixture of 6-chloro-5-cyclopropyl-2-(2-isopropoxyethoxy)nicotinonitrile (150 mg, 0.53 mmol), benzo[c][1,2]oxaborole-1,5(3H)-diol (84 mg, 0.56 mmol) and Cs2CO3 (209 mg, 0.64 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˜1:1) to afford 5-cyclopropyl-6-(1-hydroxy-1,3-dihydrobenzo[c][1,2]oxaborol-5-yloxy)-2-(2-isopropoxyethoxy)nicotinonitrile. (120 mg, 57%). 1H-NMR (400 MHz, DMSO-d6) δ (ppm) 9.18 (s, 1H), 7.86 (s, 1H), 7.76 (d, J=8.0, 1H), 7.24 (d, J=2.0, 1H), 7.16 (dd, J=8.0, 2.0, 1H), 4.96 (s, 2H), 4.04 (m, 2H), 3.42 (m, 2H), 2.05 (m, 2H), 0.97 (d, J=6.0, 6H), 0.92 (m, 2H), 0.77 (m, 2H).

출처