Boron tribromide → 4-(2-(5-Amino-8-methylbenzo[f][1,7]naphthyridin-2-yl)ethyl)-3-methylphenol

Participants

Reaction Steps

To a stirred solution of 2-(4-methoxy-2-methylphenethyl)-8-methylbenzo[f][1,7]naphthyridin-5-amine (Example 49) in methylene chloride (0.2 M) in an ice-water bath was added 1 N solution of BBr3 (2 eq) in CH2Cl2 in a drop-wise fashion. In 30 minutes the reaction was quenched with methanol and was concentrated en vacuo to obtain a crude residue. The crude material was purified by flash chromatography on a COMBIFLASH® system (ISCO) using 0-20% methanol in dichloromethane to give 4-(2-(5-amino-8-methylbenzo[f][1,7]naphthyridin-2-yl)ethyl)-3-methylphenol as a white solid. 1H NMR (DMSO-d6): δ 8.99 (s, 1H), 8.75 (d, 1H), 8.60 (d, 1H), 8.27 (d, 1H), 7.28 (s, 1H), 7.09 (dd, 1H), 6.99 (bs, 2H), 6.88 (d, 1H), 6.49 (d, 1H), 6.42 (dd, 1H), 3.02-2.96 (dd, 2H), 2.86-2.81 (dd, 2H), 2.38 (s, 3H), 2.13 (s, 3H). LRMS [M+H]=344.2

Provenance & Evidence