Sodium hydride → 6-Bromo-4-methyl-2-(2-trimethylsilanyl-ethoxymethyl)-2,10-dihydro-9-oxa-1,2,4a-triaza-phenanthren-3-one

Participants

Reaction Conditions

Reaction Steps

A solution of 6-bromo-4-methyl-2,10-dihydro-9-oxa-1,2,4a-triaza-phenanthren-3-one (4.0 g, 13.5 mmol) in anhydrous DMF (20 mL) was stirred at 0° C. Sodium hydride (60% in mineral oil, 0.8 g, 20.3 mmol) was added portion-wise and the reaction mixture was stirred at 0° C. for 0.5 h. (2-(Chloromethoxy)ethyl)trimethylsilane (3.4 g, 20.3 mmol) was added to the solution dropwise and the reaction mixture was stirred at 25° C. for 3 h. The reaction mixture was diluted with water (100 mL) and extracted with EtOAc (3×30 mL). The combined organic layer was concentrated in vacuo, washed with brine (3×30 mL), dried over anhydrous Na2SO4, filtered and concentrated to give the crude product, which was purified by chromatography on silica gel (eluting with 1% EtOAc in petroleum ether) to give 6-bromo-4-methyl-2-(2-trimethylsilanyl-ethoxymethyl)-2,10-dihydro-9-oxa-1,2,4a-triaza-phenanthren-3-one (4 g, 70%) as a yellow solid. 1H NMR (CDCl3, 400 MHz): δ 7.08 (dd, J=8.4 Hz, J=2.0 Hz, 1H), 7.01 (d, J=2.0 Hz, 1H), 6.86 (d, J=8.4 Hz, 1H), 5.08 (d, J=10.0 Hz, 2H), 4.67 (m, 1H), 4.6 (d, J=12.8 Hz, 2H), 3.65 (t, J=8.4 Hz, 2H), 1.47 (d, J=6.8 Hz, 3H), 0.95 (t, J=8.4 Hz, 2H), 0.00 (s, 9H).

Provenance & Evidence