Sodium Hydroxide → HCID 9944251, compound

Participants

Reaction Steps

A solution of 3-(2-Chloro-5-methoxycarbonylbenzyl)-tetrahydrothiopyrane-2-one IV (9.26 g, 31.0 mmol) in THF (70 mL) was purged for 15 minutes with nitrogen. A degassed aqueous sodium hydroxide solution (2.2 M, 70 mL, 154 mmol) was added to the solution and the mixture was stirred at room temperature under nitrogen overnight. The reaction mixture was washed with ether, acidified by 3N HCl at 0° C., and extracted with ether. The extract was dried over MgSO4 and concentrated to afford 5-carboxy-2-chloro-alpha-(3-mercaptopropyl)benzenepropanoic acid 10 (8.42 g, 27.8 mmol, 90%) as a white solid: 1H NMR (CD3OD) δ 1.50-1.80 (m, 4H), 2.35-2.50 (m, 2H), 2.65-2.75 (m, 1H), 2.91 (dd, J=6.2, 13.8 Hz, 1H), 2.96 (dd, J=8.8, 13.8 Hz, 1 H), 7.39 (d, J=8.3 Hz, 1H), 7.76 (dd, J=2.0, 8.3 Hz, 1H), 7.86 (d, J=2.0 Hz, 1H); 13C NMR (CD3OD) δ 25.1, 32.5, 33.2, 37.4, 46.8, 130.8, 131.2, 134.0, 139.1, 140.5, 169.2, 178.9. Anal. Calcd for C13H15ClO4S: C, 51.57; H, 4.99; S, 10.59; Cl, 11.71. Found: C, 51.59; H, 4.94; S, 10.43; Cl, 11.80.

Provenance & Evidence