(Diethoxyphosphinyl)acetic acid → HCID 86756983, compound

Participants

Reaction Steps

A solution of compound 35 (0.360 g, 1.24 mmol), diethylphosphonoacetic acid (0.266 g, 1.36 mmol, prepared as disclosed by M. P. Cooke, K. B. Bicunas, Synthesis, 283, 1981, and 1-hydroxybenzotriazole (0.251 g, 1.86 mmol) in anhydrous THF (15 ml) was treated with 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (0.285 g, 1.49 mmol). The mixture was stirred at rt for 24 h, and the solvent was evaporated under reduced pressure. The residue was purified by column chromatography on 230-400 mesh silica gel (Macherey-Nagel Silica Gel 60 Art. Nr. 81538) eluting with CH2Cl2-hexane-MeOH (98:70:4) and collecting 4 mL fractions. The appropriate fractions were combined, evaporated, and pump-dried to give intermediate 36 (0.464 g, 80%) as an oil: 1H-NMR (CDCl3, 80 Mhz) δ 1.33 (t, 6H, J=7.1 Hz, 2×CH3CH2), 1.60 (s, 9H, 3×CH3), 1.67 (s, 6H, 2×CH3), 2.02 (m, 12H, 6×CH2), 2.83 (d, 2H, J=20 Hz, CH2P), 3.86 (d, 2H, J=7.1 Hz, CH2), 4.14 (q, 4H, J=7.1 Hz, 2×CH3CH2), 5.10 (br, 3H, 3×CH), 5.20 (t, 1H, J=7.1 Hz, CH); MS (FAB+) m/e 468 (M+H)+.

Provenance & Evidence