Chlorotrimethylsilane → HCID 57061306, compound

Participants

Reaction Steps

To a solution of crude (2S,4S)-1-t-butoxycarbonyl-2-aminomethyl-4-mercaptopyrrolidine (4.1 g) in dichloromethane (250 ml) at -70° C. under a stream of nitrogen, triethylamine (8.87 ml) and trimethylchlorosilane (6.73 ml) are added. The mixture is stirred for 1 hour and 40 minutes, mixed with triethylamine (8.87 ml) and a solution of 1M-sulfamoyl chloride in dichloromethane (64 ml), and stirred for 1 hour. The reaction mixture is acidified with dilute hydrochloric acid. The organic layer is taken, diluted with 1N-hydrochloric acid (21 ml) and methanol (50 ml), stirred for 35 minutes at room temperature, and poured into water. The organic layer is taken, washed with water, dried over magnesium sulfate, and concentrated in vacuo. The residue is purified by silica gel column chromatography to give (2S,4S)-1-t-butoxycarbonyl-2-sulfamoylaminomethyl-4-mercaptopyrrolidine (4.57 g). Yield: 69%. Colorless syrup. NMR δ(CDCl3) ppm: 1.46(s, 9H), 1.5 to 1.8(m, 1H), 1.71(d, J=6.6 Hz, 1H), 2.5 to 2.67(m, 1H), 3.0 to 3.46(m, 4H), 3.85 to 4.2(m, 2H), 4.6 (br s, 2H). IR ν (CHCl3) cm-1 : 3420, 3340, 3270, 1679.

Provenance & Evidence