N-bromobutanimide → HCID 69586344, compound

Participants

Reaction Steps

To a of 0° C. cooled solution of 0.40 g (0.83 mmol) (7R,8R,9R)-10-acetyl-8-(2-methoxyethoxy)-2-methyl-9-phenyl-7-pivaloyloxy-7.8.9.10-tetrahydroimidazo[1.2-h][1.7]naphthyridine in ethanol (5 ml) is added 0.15 g (0.83 mmol) NBS and the mixture is stirred for 1 h. Afterwards the reaction is quenched by adding of saturated aqueous sodium hydrogen carbonate solution and it is extracted twice with dichloromethane. The combined organic layers are washed with brine, dried over sodium sulphate and evaporated in vacuo. The crude product is purified by column chromatography (ether/triethylamine: 95/5) to provide 0.30 g (0.53 mmol/65%) of the title compound as an amorphous solid. 1H-NMR (200 MHz, [D6] DMSO): δ=0.96 (s, 9H), 2.09(s, 3H), 2.42(s, 3H), 3.23(s, 3H), 3.40–3.53 (m, 2H), 3.69–3.98 (m, 2H), 4.23(t, 1H), 5.75 (d, 1H), 6.02 (s, 1H), 6.80(d, 1H), 7.16(s, 5H), 8.18(d, 1H).

Provenance & Evidence