反应详情

To a stirred solution of 4-nitrophenyl (2-adamantyl)carbamate (40 mg, 0.12 mmol) in CH2Cl2 (2 mL) was added tert-butyl azetidin-3-ylcarbamate (40 mg, 0.23 mmol), followed by i-Pr2NEt (0.05 mL, 0.28 mmol). The mixture was stirred over the weekend and applied to a 10-mL ChemElut cartridge prewetted with 5% aq HCl (6 mL). The cartridge was eluted with ether (20 mL). The eluate was evaporated to dryness and the residue was applied to 2-g silica SPE cartridge which was eluted sequentially with 0, 25, 50, 75, 100 and 100% EtOAc in hexanes (15 mL of each) to afford six fractions. Fraction 4 was concentrated to provide tert-butyl 1-(2-adamantylcarbamoyl)azetidin-3-ylcarbamate (19 mg, 43%). LC-MS Method 1, tR=1.74 min, m/z=350, 294; 1H NMR (CDCl3) 1.45 (s, 9H), 1.60-1.95 (14H), 3.75 (m, 2H), 3.89 (m, 1H), 4.22 (m, 2H), 4.39 (d, 1H), 4.46 (1H), 5.06 (1H).

1. washThe cartridge was eluted with ether (20 mL)
2. customThe eluate was evaporated to dryness
3. washwas eluted sequentially with 0, 25, 50, 75, 100 and 100% EtOAc in hexanes (15 mL of each)
4. customto afford six fractions
5. concentrationFraction 4 was concentrated