Triphenylphosphine → (2S,4S)-4-acetylthio-1-allyloxycarbonyl-2-(N-sulfamoyl-N-allyloxycarbonylamino)methylpyrrolidine

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Reaction Steps

To a solution of (2S,4S)-4-acetylthio-1-allyloxycarbonylpyrrolidine-2-methanol (8.02 g: ca. 30 mmole) in ethyl acetate (83 ml) under ice cooling, triphenylphosphine (9.44 g: 13.6 mmole), N-allyloxycarbonylsulfamide (3.12 g: 15.9 mmole), and azodicarboxylic acid diethylester (5.67 ml: 36 mmole) are successively added. The mixture is stirred under ice cooling for 55 minutes and at room temperature for 4 hours. The reaction mixture is dissolved in toluene (60 ml), concentrated, diluted with toluene (60 ml), filtered to remove separating crystals, and the filtrate is concentrated. The residue is purified by silica gel chromatography to give (2S,4S)-4-acetylthio-1-allyloxycarbonyl-2-(N-sulfamoyl-N-allyloxycarbonylamino)methylpyrrolidine (6.74 g). Yield: 55%. Colorless oil. NMR δ(CDCl3) ppm: 1.5 to 1.7(m, 1H), 2.35(s, 3H), 2.5 to 2.7(m, 1H), 3.19 (dd, J=6.3 Hz, J=11.5 Hz, 1H), 3.68 (dd, J=3.8 Hz, J=14.5 Hz, 1H), 3.9 to 4.3(m, 3H), 4.3 to 4.7(m, 5H), 5.2 to 5.4(m, 4H), 5.8 to 6.1(m, 4H).

Provenance & Evidence