Diethyl Ether → HCID 59772735, compound

Participants

Reaction Steps

Boron tribromide (1M in dichloromethane, 21 mL, 21.17 mmol) was added dropwise to a cold (−78° C.) suspension of 2-amino-5-(1-ethyl-5-propionyl-1-H-pyrrol-3-yl)-5-(3-methoxy-phenyl)-3-methyl-3,5-dihydro-imidazol-4-one (1.3 g, 3.52 mmol) in CH2Cl2. The mixture was allowed to warm to room temperature, stirred for 20 h, and poured slowly into cold (0° C.) ethyl ether, treated slowly with methanol over a 10 minute period, basified to pH 8 at 0° C. with saturated aqueous NaHCO3 and extracted with CHCl3. The combined CHCl3 extracts were washed with brine, dried over MgSO4 and evaporated to dryness. The resultant residue was purifiied by flash chromatography (ethyl acetate/methylene chloride/methyl alcohol/triethyl amine, 5/4.4/0.5/0.1) to give the title compound as a white solid (0.95 g, 72% yield), mp 101° C., 1H NMR (400 MHZ, DMSO-d6) δ 0.99 (t, 3H), 1.17 (t, 3H), 2.66-2.68 (q, 2H), 2.90 (s, 3H).4.19-4.21 (q, 2H), 6.5 (bs, 2H), 6.55 (m, 1H), 6.84-6.88 (m, 3H), 7.01 (m, 2H), 9.21 (bs, 1H), MS m/e (M−H)− 353.1.

Provenance & Evidence