[CH3:1][S:2]([CH2:5][CH2:6][NH:7]C(=O)OC(C)(C)C)(=[O:4])=[O:3].[F:15][C:16]([F:21])([F:20])[C:17]([OH:19])=[O:18]>ClCCl>[F:15][C:16]([F:21])([F:20])[C:17]([OH:19])=[O:18].[CH3:1][S:2]([CH2:5][CH2:6][NH2:7])(=[O:4])=[O:3]In a dried reaction flask, tert-butyl 2-(methylsulfonyl)ethylcarbamate (0.906 g, 4.06 mmol) was dissolved in dichloromethane (60 mL). Trifluoroacetic acid (27.8 mL) was added dropwise at −10° C. The mixture was stirred for 1.5 hr, and was concentrated at reduced pressure to produce a crude brown oil (1.258 g).
読み込み中…