Nitrogen → Methyl 1-(4-bromo-2-iodobenzyl)-4-(difluoromethyl)cyclohexanecarboxylate

Participants

Reaction Conditions

Reaction Steps

Methyl 4-(difluoromethyl)cyclohexanecarboxylate (Intermediate 89, 2.46 g, 12.8 mmol) was dissolved in THF (25 mL). The atmosphere was exchanged to N2 (g), and the solution was cooled to −78° C. Lithium diisopropylamide (1.8M in THF/heptane/ethylbenzene) (8.51 mL, 15.3 mmol) was added, while the temperature was kept at −78° C. The solution was stirred for 60 min at −78° C. A solution of 4-bromo-1-(bromomethyl)-2-iodobenzene (see Caruso, A.; Tovar, J., D. J. Org. Chem. 2011, 76, 2227-2239, 4.8 g, 12.8 mmol) in THF (5.0 mL) was added via syringe. The reaction was removed from the cooling bath, and allowed to reach r.t., while stirred for 2.5 h. Water (30 mL) was added, followed by DCM (30 mL). The organic layer was collected and dried over MgSO4, filtered and evaporated in vacuo. The residue was purified by flash chromatography, (0-100% EtOAc in heptanes, 220 g SiO2) to give the title compound (3.29 g, 53% yield): 1H NMR (500 MHz, CDCl3) δ ppm 1.11-1.20 (m, 2 H), 1.39 (td, 2 H), 1.67-1.80 (m, 3 H), 2.30 (d, 2 H), 3.01 (s, 2 H), 3.70 (s, 3 H), 5.49 (d, 1 H), 6.89 (d, 1 H), 7.38 (dd, 1 H), 7.99 (d, 1 H), MS (CI) m/z 487 [M+H]|.

Provenance & Evidence