反应详情

温度

65 °C

To (R)-tert-butyl 2-(methoxy(methyl)carbamoyl)pyrrolidine-1-carboxylate (716 mg, 2.77 mmol) in THF (27.700 mL) at 0° C. was added (4-(benzyloxy)phenyl)magnesium bromide (8.32 mL, 16.63 mmol) dropwise. After complete addition, the solution was heated to 65° C. for 1 h. The reaction was cooled to 0° C., quench carefully with 1N HCl and extracted with EtOAc (3×). The combined organic layers were washed with brine, dried over MgSO4, filtered and concentrated. The residue was purified by column chromatography on silica gel (5%→60% ethyl acetate in hexanes) to afford (R)-tert-butyl 2-(4-(benzyloxy)benzoyl)pyrrolidine-1-carboxylate (533 mg, 1.397 mmol, 50.4% yield) as an amorphous yellow solid. 1H NMR (400 MHz, CDCl3) δ 7.87-8.00 (m, 2H), 7.29-7.47 (m, 5H), 6.95-7.07 (m, 2H), 5.13-5.31 (m, 1H), 5.10-5.13 (m, J=3.78 Hz, 2H), 3.40-3.73 (m, 2H), 2.19-2.35 (m, 1H), 1.82-1.98 (m, 3H), 1.21-1.30 (m, 9H); LRMS (ESI) m/e 282.17 [(M-Boc+H)+, calcd for C18H20NO2 282.15]; m/e 404.11 [(M+Na)+, calcd for C23H27NNaO4 404.18].

1. additionAfter complete addition
2. temperatureThe reaction was cooled to 0° C.
3. customquench carefully with 1N HCl
4. extractionextracted with EtOAc (3×)
5. washThe combined organic layers were washed with brine
6. dry with materialdried over MgSO4
7. filtrationfiltered
8. concentrationconcentrated
9. customThe residue was purified by column chromatography on silica gel (5%→60% ethyl acetate in hexanes)