Sodium Bicarbonate → S-Ethyl 3-(diethylphosphono)propionyloxymethyl carbonothioate

Participants

Reaction Steps

To a mixture of 3-(diethylphosphono)propanoic acid (79, 1.0 g, 4.76 mmol) in H2O (12 mL) and CH2Cl2 (12 mL) was added NaHCO3 (1.0 g, 11.9 mmol) and TBAHSO4 (1.62 g, 4.76 mmol). After stirring for 20 min, S-ethyl O-iodomethyl carbonothioate (1.17 g, 4.76 mmol) in CH2Cl2 (2 mL) was added. The biphasic reaction was stirred vigorously for 4 h 20 min and was diluted with water and CH2Cl2. The layers were separated, the organic layer was washed with H2O, 0.5 N HCl solution, saturated NaHCO3 solution, saturated NaCl solution, dried over MgSO4, filtered and concentrated to dryness. The crude product was triturated with Et2O and the solids were removed by filtration and rinsed with small portions of Et2O. After concentration, the combined filtrates were purified by flash chromatography on a Biotage™ flash chromatography system, using EtOAc as the eluent, to yield compound 80 (1.29 g, 83%) as a colorless oil: 1H NMR (400 MHz, CDCl3) δ 1.30-1.65 (m, 9H), 2.03-2.12 (m, 2H), 2.64-2.71 (m, 2H), 2.90 (q, J=7.4 Hz, 2H), 4.06-4.14 (m, 4H), 5.82 (s, 2H). 31P NMR (162 MHz, CDCl3) δ 30.45 (s).

Provenance & Evidence