反应详情

To a solution of (2S,4S)-1-p-nitrobenzyloxycarbonyl-2-sulfamoylaminomethyl-4-tritylthiopyrrolidine (668 mg: 0.95 mmole) in tetrahydrofuran (6 ml), a solution of pyridine (0.254 ml: 2.7 eq.) and silver nitrate (403 mg: 2.5 eq.) in water (2 ml) is added under ice cooling. The mixture is stirred at room temperature for 1 hour. The reaction mixture is diluted with dichloromethane (3 ml) and methanol (3 ml), and hydrogen sulfide is bubbled through it under ice cooling for 10 minutes. The resulting precipitate is removed by filtering. The filtrate is diluted with dichloromethane, washed with water, dried over magnesium sulfate, and concentrated in vacuo. The residue is purified by silica gel column chromatography (toluene: ethyl acetate) to give (2S,4S)-1-p-nitrobenzyloxycarbonyl-2-sulfamoylaminomethyl-4-mercaptopyrrolidine (233 mg). Yield: 63%. NMR δ(CDCl3 -CD3OD) ppm: 1.42(t, J=7 Hz, 1H), 1.65 to 1.93(m, 1H), 2.48 to 2.70 (m, 1H), 3.05 to 3.63(m, 4H), 3.93 to 4.16(m, 2H), 5.22(s, 2H), 7.53(d, J=8 Hz, 2H), 8.23(d, J=8 Hz, 2H). IR ν (CHCl3) cm-1 : 3276br, 1692, 1607.

1. customis bubbled through it under ice cooling for 10 minutes
2. customThe resulting precipitate is removed
3. filtrationby filtering
4. additionThe filtrate is diluted with dichloromethane
5. washwashed with water
6. dry with materialdried over magnesium sulfate
7. concentrationconcentrated in vacuo
8. customThe residue is purified by silica gel column chromatography (toluene: ethyl acetate)