Hydrochloric Acid → HCID 9900104, compound

Participants

Reaction Steps

A solution of methyl 3-(4-acetylthio-1-methoxy-carbonylbutoxy)benzoate XV (8.00 g, 23.5 mmol) in THF (60 mL) was deoxygenated by bubbling N2 through the solution for 1 hour. To the solution was added deoxygenated 3 N NaOH (47 mL, 141 mmol) and the mixture was stirred for 24 hours at room temperature under N2. The mixture was acidified with 1 N HCl and extracted with EtOAc (3×300 mL). The organic extracts were washed with water (300 mL) and brine (300 mL), dried over MgSO4, filtered, and concentrated. The residual oil was dissolved in ether and the solution was concentrated to afford 3-(1-carboxy-4-mercaptobutoxy)-benzoic acid 14 (4.40 g, 16.3 mmol, 69%) as a white solid: 1H NMR (CDCl3) δ 1.40 (t, J=7.9 Hz, 1H), 1.83-1.99 (m, 2H), 2.11-2.22 (m, 2H), 2.63 (m, 2H), 4.76 (dd, J=7.3, 5.0 Hz, 1H), 7.23 (m, 1H), 7.38 (t, J=7.8 Hz, 1H), 7.49 (m, 1H), 7.72 (d, J=7.7 Hz, 1H); 13C NMR (CDCl3) δ 24.1, 29.6, 31.2, 75.5, 114.8, 122.1, 123.9, 129.9, 130.5, 157.6, 171.8, 177.1. Anal. Calcd for C12H14O5S: C, 53.32; H, 5.22; S, 11.86. Found: C, 53.04; H, 5.38; S, 11.58.

Provenance & Evidence