反应详情

A flame-dried vial equipped with a magnetic stir bar was charged with Togni reagent (2.0 g, 7.0 mmol) and CuI (34 mg, 0.35 mmol), and was sealed with a septum. The vial was evacuated and backfilled with N2 for three times. MeOH (8 mL) and tert-butyl 4-acetoxy-4-allylpiperidine-1-carboxylate (4.5 g, 14 mmol) were then added via syringe. The vial was kept at 80° C. for 2 h. The reaction mixture was concentrated in vacuo and the crude residue was purified by a standard method to afford the product (2.1 g). 1H NMR (400 MHz, CHLOROFORM-d) δ: 1.47 (s, 9 H), 1.66-1.77 (m, 2H), 2.00-2.07 (m, 3 H), 2.22 (d, J=13.43 Hz, 2 H), 2.85 (qdd, J=10.61, 10.61, 10.61, 7.25, 1.21 Hz, 2 H), 3.11 (t, J=11.82 Hz, 2 H), 3.81 (br. s., 2 H), 5.58 (dt, J=15.98, 7.19 Hz, 1 H), 6.05 (d, J=16.12 Hz, 1 H).

1. customA flame-dried vial equipped with a magnetic stir bar
2. customwas sealed with a septum
3. customThe vial was evacuated
4. concentrationThe reaction mixture was concentrated in vacuo
5. customthe crude residue was purified by a standard method