Acetic Acid → HCID 66748087, compound

Participants

Reaction Steps

4-cyano-3-iodo-5-morpholin-4-ylthiophene-2-carboxylic acid (1.44 g, 3.96 mmol, prepared as in WO2009/154741) was suspended in anhydrous tetrahydrofuran (80.0 mL, 986 mmol), sonicated under nitrogen atmosphere for 10 min, and cooled in an acetone-dry ice bath for 10 minutes. Phenyllithium (1.8M in n-butyl ether, 8.81 mL, 15.9 mmol) was added dropwise over 7 minutes. The suspension was stirred with cooling for 5 minutes, at which point the cooling bath was removed and the suspension was stirred without cooling for 7 minutes. Reaction mixture was recooled in an acetone-dry ice bath for 10 minutes, at which point a solution of N-[(E)-(4-chlorophenyl)methylene]-2-methylpropane-2-sulfinamide (2.91 g, 11.9 mmol) in anhydrous tetrahydrofuran (20.0 mL, 246 mmol) was added dropwise over 8 minutes, and the mixture was stirred with cooling for 30 minutes. The mixture was quenched with methanol (5.0 mL, 120 mmol) and then acetic acid (1.0 mL, 18 mmol), and allowed to warm to room temperature. The volatiles were removed in vacuo, and the residue was diluted with water and EtOAc. The layers were separated, and the aqueous layer was extracted with 2×EtOAc. The combined organic layers were washed with water and brine, dried over Na2SO4, filtered, and concentrated in vacuo. Purification via column chromatography (gradient elution: AcOH/MeOH/DCM, 0/0/100 to 0.5/4.5/95) afforded 3-{[(tert-butylsulfinyl)amino](4-chlorophenyl)methyl}-4-cyano-5-(morpholin-4-yl)thiophene-2-carboxylic acid as a mixture of diastereomers. Major diastereomer: 1.19 g, yield 62.2%. (FA) ES+ 482; ES− 480; 1H NMR (400 MHz, CDCl3) δ 7.31-7.33 (m, 2H), 7.15-7.17 (m, 2H), 6.14 (br s, 2H), 3.87-3.89 (m, 4H), 3.60-3.63 (m, 4H), 1.21 (s, 9H). Minor diastereomer: (0.292 g, yield 15.3%). (FA) ES+ 482; ES− 480; 1H NMR (400 MHz, CDCl3) δ 7.26-7.34 (m, 4H), 6.29-6.38 (m, br, 2H), 3.84-3.86 (m, 4H), 3.56-3.60 (m, 4H), 1.35 (s, 9H).

Provenance & Evidence