Acetic Acid → HCID 69732875, compound

Participants

Reaction Steps

To a mixture of (R)-8-benzyl-1,7-dimethyl-3-(5-hydroxyhexyl)pyrido[2,3-d]pyrimidine-2,4,5(1H,3H,8H)-trione (1.26 g, 3.18 mmol), triphenylphosphine (2.50 g, 9.52 mmol), acetic acid (0.54 ml, 9.52 mmol) and tetrahydrofuran (20 ml), cooled in an ice bath, was added diethylazodicarboxylate (1.5 ml, 9.5 mmol) dropwise. After stirring at room temperature for 4hours, the mixture was concentrated under reduced pressure. The residue was purified by column chromatography on silica gel eluting with 20% ethyl acetate-hexanes to afford (S)-3-(5-acetoxyhexyl)-8-benzyl-1,7-dimethylpyrido[2,3-d]pyrimidine-2,4,5(1H,3H,8H)-trione (1.2 g, 86% yield) as an oil. 1H NMR (300 MHz, CDCl3) δ 1.20 (d, 3H), 1.30-1.75 (m, 6H), 2.02 (s, 3H), 2.49 (s, 3H), 3.67 (s, 3H), 4.03 (t, 2H), 4.88 (sextet, 1H), 5.30 (s, 2H), 6.56 (s, 1H), 7.30-7.56 (m, 5H).

Provenance & Evidence