反应详情

Triphenylphosphine (766 mg, 2.92 mmol) was dissolved in DCM (100 mL) followed by addition of I2 (741 mg, 2.92 mmol) and TEA (0.81 mL, 5.84 mmol) at 0° C. (R)—N′-(2-(4-cyano-2-methyl-3-(trifluoromethyl)phenylamino)-3-hydroxy-3-methylbutanoyl)-4-fluorobenzohydrazide (660 mg, 1.46 mmol) in DCM (20 mL) and THF (10 mL) was added to the pre-cooled solution mixture of PPh3/I2/TEA system and stirred for 30 min. The reaction mixture was then concentrated to furnish a yellow solid (781 mg). The crude material was chromatographed with EtOAc:Hexanes (2:1) to furnish the title compound as a white solid (361 mg, 57%). 1H NMR (500 MHz, Acetone d6, δ in ppm): 7.97-7.94 (m, 2H), 7.49 (d, J=9 Hz, 1H), 7.19-7.14 (m, 2H), 6.81 (d, J=9 Hz, 1H), 5.55 (d, J=9 Hz, 1H), 4.72 (d, J=9 Hz, 1H), 2.35 (s, 3H), 1.50 (s, 3H) and 1.35.

1. concentrationThe reaction mixture was then concentrated