Bromotrimethylsilane → (E)-2-(5-Amino-2-(4-methoxy-2-methylphenethyl)benzo[f][1,7]naphthyridin-8-yl)-1-fluorovinylphosphonic acid

Participants

Reaction Steps

To a solution of (E)-diethyl 2-(5-amino-2-(4-methoxy-2-methylphenethyl)benzo[f][1,7]naphthyridin-8-yl)-1-fluorovinylphosphonate (3-2) (1.0 equiv.) in DCM (0.05 M) at 0° C. was added TMSBr (10 equiv.). The reaction was warmed to room temperature over 2 hours, and then quenched with small amounts of MeOH. The DCM was removed by evaporation, and then DMSO/water was added. The mixture was adjusted to pH 9 and directly purified on RP-HPLC using a C18 column, eluting with 10-40% 95:5 (MeCN/5 mM NH4OAc) in 10 mM NH4OAc (pH 9) gradient. The fractions containing the product were combined and concentrated in vacuo to give (E)-2-(5-Amino-2-(4-methoxy-2-methylphenethyl)benzo[f][1,7]naphthyridin-8-yl)-1-fluorovinylphosphonic acid (12) as a solid. 1H NMR (Dimethylsulfoxide-d6): δ 9.80 (s, 1H), 9.41 (s, 1H), 9.05 (s, 1H), 8.87 (s, 1H), 8.65 (d, 1H, J=8.8 Hz), 8.08 (s, 1H), 7.76 (d, 1H, J=8.4 Hz), 7.08 (d, 1H, J=8.4 Hz), 7.02 (d, 1H, J=8.4 Hz), 6.83-6.65 (m, 2H), 3.69 (s, 3H), 3.18-3.12 (m, 2H), 3.02-2.96 (m, 4H), 2.28 (s, 3H). LRMS [M+H]=468.1

Provenance & Evidence