Water → HCID 57867358, compound

Participants

Reaction Steps

To a stirred solution of ((2R,4R)-3-acetoxy-5-(6-chloro-9H-purin-9-yl)-4-fluoro-3,4-dimethyl-tetrahydrofuran-2-yl)methyl benzoate (about 0.4 g, 0.86 mmol) in ethanol (about 5 ml) was added isobutyl amine (about 1.03 ml, 10.38 mmol) and refluxed for about 20 minutes. Completion of the reaction monitored by thin-layer chromatography, water added to the reaction mixture and the aqueous layer was extracted with ethyl acetate and the combined organic layers were washed with brine and dried over sodium sulphate. Concentration under reduced pressure and purification by silica gel column chromatography using 40% ethyl acetate in hexane as eluent furnished title compound (0.18 g) as a colorless gummy mass. Yield: 41.6%; 1H NMR (300 MHz, CDCl3): δ 8.39 (s, 1H), 8.06-7.79 (m, 3H), 7.58-7.55 (m, 3H), 6.54 (d, 1H, J=23.4 Hz), 5.90 (bs, 1H), 4.83-4.78 (m, 2H), 4.49-4.44 (m, 1H), 3.49 (m, 2H), 2.14 (s, 3H), 2.09-1.90 (m, 1H), 1.89 (d, 3H, J=2.4 Hz), 1.45 (d, 3H, J=22.8 Hz), 1.02 (d, 6H, J=6.6 Hz); Mass: [M+1]+ 500 (100%), 501 (35%); IR cm−: 3372, 3141, 2927, 1752, 1622, 1274, 1063, 1026, 952, 713; HPLC: 94.7%.

Provenance & Evidence