Acetic Acid → N-[4-chloro-2-(cyclohexylisopropoxyiminomethyl)phenyl]trifluoromethanesulfonamide

Participants

Reaction Steps

N,N-Dimethylethylenediamine (254 μL, 2.20 mmol) was added to a solution of N-isopropoxyphthalimide (308 mg, 1.50 mmol) in EtOH (5 mL), and the reaction allowed to stir at RT for 15 hours. Glacial acetic acid (2 mL) was then added to adjust the mixture to ca. pH 4, followed by the addition of N-(4-chloro-2-cyclohexanecarbonylphenyl)-trifluoromethanesulfonamide 29E (370 mg, 1.0 mmol), and the reaction stirred for 15 hours at RT. The reaction mixture was concentrated under vacuum, and the residue dissolved in Et2O (50 mL) and washed with water, brine, dried over MgSO4 and the solvent removed under reduced pressure. The residue was purified by column chromatography (eluting with CH2Cl2/PE, 1:1) to afford N-[4-chloro-2-(cyclohexylisopropoxyiminomethyl)phenyl]trifluoromethanesulfonamide 210 (390 mg, 91%), as a colorless oil. 1H n.m.r. (400 MHz, CDCl3) (1:1 mixture of E- and Z-isomers) δ 10.59, br s, 1H; 8.11, br s, 1H, 7.61, d, J=8.8 Hz, 1H, 7.49, d, J=8.8 Hz, 1H, 7.46, d, J=2.4 Hz, 1H, 7.42, dd, J=2.4 and 8.8 Hz, 1H, 7.30, dd, J=2.4 and 8.8 Hz, 1H, 7.24, d, J=2.4 Hz, 1H, 4.49, m, 1H, 4.39, m, 1H, 2.97, m, 1H, 2.45, m, 1H, 1.97-1.71, m, 14H, 1.34-1.24, m, 18H. HRMS (M+) 426.0983.

Provenance & Evidence