Dicyclohexylcarbodiimide → AcGlyCH2PPh2

Participants

Reaction Steps

Phosphinothiol 20 (100 mg, 0.43 mmol) and N-acetylglycine (55 mg, 0.47 mmol) were dissolved in DMF (3 mL) under Ar(g). DCC (98 mg, 0.47 mmol) was added, and the mixture was stirred for 12 h at room temperature. The DCU by-product was removed by filtration, solvent was removed under reduced pressure, and the residue was purified by chromatography as in Method A. AcGlyCH2PPh2 was isolated as a white solid in 67% yield. Spectral data. 1H NMR (CDCl3, 300 MHz) δ 7.46-7.39 (m, 4 H), 7.38-7.36 (m, 6 H), 6.44 (bs, 1 H), 4.15 (d, J=5/7 Hz, 2 H), 3.53 (d, J=3.6 Hz, 2 H), 2.02 (s, 3 H) ppm; 13C NMR (CDCl3, 75 MHz) δ 196.13, 170.29, 136.45 (d, J=13.6 HZ), 132.62 (d, J=19.1 Hz), 129.17, 128.54 (d, J=6.7 Hz), 48.98, 25.29 (d, J-24.2 Hz), 22.84 ppm; 31P NMR (CDCl3, 121 MHz) δ −15.20 ppm; MS (ESI) m/z 331.08 (MH+—332.2, MK+—370.0).

Provenance & Evidence