Potassium Hydroxide → (4S,5R)-5-[3,5-bis(trifluoromethyl)phenyl]-3-[(2'-chloro-4-cyclopropyl-5'-isopropylbiphenyl-2-yl)methyl]-4-methyl-1,3-oxazolidin-2-one

Participants

Reaction Steps

To a solution of (4S,5R)-5-[3,5-bis(trifluoromethyl)phenyl]-3-[(4-bromo-2′-chloro-5′-isopropylbiphenyl-2-yl)methyl]-4-methyl-1,3-oxazolidin-2-one (27 mg, 0.043 mmol) in 1,4-dioxane (1 mL) was added cyclopropylboronic acid (9 mg, 0.10 mmol), [1,1′-bis(diphenylphosphino) ferrocene] dichloropalladium (II) (10.4 mg, 30 mol %) and aqueous potassium hydroxide (42 μL, 3M, 3 eq.). The reaction mixture was purged with nitrogen and then sealed in a microwave vessel. The reaction vessel was subject to microwave irradiation at 120° C. for 20 min. Crude mixture was worked up with water and EtOAc. The combined organic extracts were dried over Na2SO4 and concentrated in vacuo to give the crude product. This was purified by preparative TLC plate eluted by 20% EtOAc in hexanes to afford the titled compound. LC-MS: 595.99 (M+1)+. 1H NMR (CDCl3, 500 MHz) a 6:4 mixture of rotamers δ 7.82-7.86 (m, 1H), 7.66-7.72 (m, 2H), 7.36-7.40 (m, 1H), 7.21-7.23 (m, 0.5H), 7.11-7.19 (m, 3H), 7.01-7.08 (m, 1.5H), 5.58 (d, J=8.0 Hz, 0.4H), 5.50 (d, J=8.0 Hz, 0.6H), 4.88 (d, J=15.1 Hz, 0.6H), 4.71 (d, J=15.6 Hz, 0.4H), 3.76-3.95 (m, 2H), 2.84-2.95 (m, 1H), 1.92-2.00 (m, 1H), 1.18-1.29 (m, 6H), 1.00-1.07 (m, 2H), 0.71-0.82 (m, 2H), 0.47 (d, J=6.6 Hz, 1.2H), 0.42 (d, J=6.6 Hz, 1.8H).

Provenance & Evidence