反应详情

A solution of 2-(tert-butoxycarbonylamino)phenylboronic acid (1.0 eq.) and 3-chloro-5-vinylpicolinonitrile (from step 1) (1.0 eq.), tetrakis(triphenyl-phosphine)palladium (5 mol %), and 2N aqueous sodium carbonate solution (2.0 eq.) in toluene/ethanol (2:1, 0.03 M) was stirred at 100° C. overnight. After cooling to ambient temperature, the reaction content was diluted with methanol. The insoluble solids were filtered off, and the filtrate was concentrated en vacuo to obtain a crude residue. The crude material was purified by flash chromatography on a COMBIFLASH® system (ISCO) using 0-80% ethyl acetate in hexane to give 2-vinylbenzo[f][1,7]naphthyridin-5-amine as a yellow solid. 1H NMR (methanol-d4-CDCl3): δ 8.87 (d, 1H), 8.69 (d, 1H), 8.28 (d, 1H), 7.49-7.58 (m, 2H), 7.32 (dt, 1H), 6.90 (dd, 1H), 6.09 (d, 1H), 5.54 (d, 1H). LRMS [M+H]=222.1.

1. filtrationThe insoluble solids were filtered off
2. concentrationthe filtrate was concentrated en vacuo
3. customto obtain a crude residue
4. customThe crude material was purified by flash chromatography on a COMBIFLASH® system (ISCO)