反应详情

To (bromomethyl)cyclobutane (211 mg, 1.42 mmol) in THF (20 mL) was added magnesium (41.3 mg, 1.7 mmol), and initiator iodine (10 mg). The mixture was stirred at rt for 2 hrs, then cooled to −40° C. and added to a solution of Example 21A (100 mg, 0.28 mmol) in THF (20 mL). The mixture was allowed to warm to room temperature, quenched with saturated aqueous NH4Cl, and extracted with EtOAc (2×). The organics were combined, dried (MgSO4), filtered and solvent evaporated. The residue was purified by column chromatography using an Analogix® Intelliflash280™ (SiO2, 0-50% Hexane in ethyl acetate) to afford 63 mg (53%) of the title compound. 1H NMR (400 MHz, CDCl3) δ ppm 1.62-1.78 (m, 2H) 1.65 (s, 9H) 1.76-1.94 (m, 2H) 1.97-2.18 (m, 4H) 2.47-2.59 (m, 1H) 3.92 (s, 3H) 4.88 (dd, J=8.29, 6.14 Hz, 1H) 6.93 (d, J=8.90 Hz, 1H) 7.37 (dd, J=8.90, 3.07 Hz, 1H) 7.95 (s, 1H) 8.05 (d, J=2.76 Hz, 1H); MS (DCI/NH4+) m/z 423 (M+H)+.

1. temperaturecooled to −40° C.
2. temperatureto warm to room temperature
3. customquenched with saturated aqueous NH4Cl
4. extractionextracted with EtOAc (2×)
5. dry with materialdried (MgSO4)
6. filtrationfiltered
7. customsolvent evaporated
8. customThe residue was purified by column chromatography