Triphenylphosphine → S-3-(tert-butoxycarbonylamino)propyl ethanethioate

Participants

Reaction Conditions

Reaction Steps

tert-Butyl 3-hydroxypropylcarbamate (3.22 g, 18.37 mmol) in 100 ml of DCM at 0° C. was added thiolacetic acid (2.0 ml, 26.73 mmol) and triphenylphosphine (7.0 g, 26.73 mmol) under Ar. After stirred at 0° C. for 15 min, DIAD (6.0 ml, 28.93) was added. The mixture was stirred at 0° C. for 2 h then RT overnight. The mixture was concentrated, diluted with 120 ml of EtAc/Hexane (1:2), filtered through celite. The solution was washed with NaHCO3 (conc.)/NaCl (conc.) and 1 M NaH2PO4 respectively, dried over MgSO4, filtered, evaporated and purified on SiO2 chromatography eluted with EtAc/Hexane (1:7 to 1:6) to afford 3.22 g (75%) of the title compound. 1H NMR (CDCl3) 3.09 (t, 2H, J=6.5 Hz), 2.84 (t, 2H, J=6.9 Hz), 2.27 (s, 3H), 1.69 (dt, 2H, J=6.8, 13.5 Hz),1.38 (s, 9H); 13C NMR 196.35, 156.16, 79.50, 39.26, 30.79, 30.24, 28.61, 26.44; MS m/z+ 256.0 (M+Na).

Provenance & Evidence