反应详情

A stirred solution of tert-butyl 3-(2-hydroxyethyl)azetidine-1-carboxylate (254 mg, 1.26 mmol), Ph3P (381 mg, 1.45 mmol.15), imidazole (129 mg, 1.89 mmol0) and acetonitrile (6.5 mL) at 0° C.; was treated with iodine (368 mg, 1.45 mmol.15). Mixture was allowed to reach 25° C. and stirring continued for 18 h. The reaction mixture was then diluted with water and extracted with hexanes (6×25 mL). The combined organics were dried (MgSO4) and concentrated, then purified by chromatography (40 g column, 50 μm from Analogix, 0-30% EtOAc in hexanes over 15 min to give tert-butyl 3-(2-iodoethyl)azetidine-1-carboxylate (271 mg, 871 μmol, 69.0%) as a colorless oil. 1H NMR (CDCl3) δ: 4.03 (t, J=8.3 Hz, 2H), 3.56 (dd, J=8.7, 5.7 Hz, 2H), 3.10 (t, J=7.0 Hz, 2H), 2.63 (quint, J=7.8, 5.4 Hz, 1H), 2.13 (q, J=7.1 Hz, 2H), 1.42 (s, 9H).

1. customat 0° C.
2. customto reach 25° C.
3. extractionextracted with hexanes (6×25 mL)
4. dry with materialThe combined organics were dried (MgSO4)
5. concentrationconcentrated
6. custompurified by chromatography (40 g column, 50 μm from Analogix, 0-30% EtOAc in hexanes over 15 min