反应详情

TBTU (6.87 g, 21.4 mmol) was added to a stirred suspension of 2-(tert-butoxycarbonylamino)-3,3,3-trifluoropropanoic acid, which is commercially available, in DCM (50 mL). NMM (4.4 mL, 40 mmol) and 3-hydroxyazetidinol hydrochloride (2.48 g, 22.6 mmol) were added. The mixture was stirred at rt for 4 h. The turbid solution was diluted with DCM (70 mL) and washed with NaHCO3 solution (saturated, 1×100, 2×20 mL). After drying (Na2SO4) the solvent was evaporated under reduced pressure. The residue was stirred at rt with isohexanes (60 mL) to yield the title product (3.97 g, 97%) as a colourless powder. 1H NMR (500 MHz, DMSO-d6) δ 7.86-8.05 (1H), 5.71-5.87 (1H), 4.86-5.03 (1H), 4.27-4.54 (2H), 4.04-4.15 (1H), 3.78-3.97 (1H), 3.56-3.68 (1H), 1.38-1.4 (9H). Ratio of rotamers ˜6:4.

1. washwashed with NaHCO3 solution (saturated, 1×100, 2×20 mL)
2. dry with materialAfter drying (Na2SO4) the solvent
3. customwas evaporated under reduced pressure
4. stirringThe residue was stirred at rt with isohexanes (60 mL)