Hydrochloric Acid → HCID 15428158, compound

Participants

Reaction Steps

To compound 1 (20.0 g, 18.2 mmol) and thioacetic acid (27.0 mL, 20 eq.) in dry toluene (80 mL) under argon was added tin (IV) chloride (21.3 mL) dropwise at room temperature. The reaction was monitored by Tlc carefully. After 1 h, 600 mL of 1M aqueous HCl was added to the vigorously stirred mixture and the resulting mixture was filtered through Celite to remove the emulsion of tin salts. The mixture was diluted with pentane (800 mL), washed with water (2×400 mL), saturated sodium hydrogen carbonate (300 mL) and water (300 mL), dried with Na2SO4 and concentrated. The residue was purified by column chromatography three times (SiO2, pentane/EtOAc 20:1, 30:1, 40:1) to give 1-S-acetyl-2,3,4,6-tetra-O-lauroyl-1-thio-α-D-galactopyranose (3.65 g, 21%). 1H-Nmr data (CHCl3): δ 6.26 (d, 1H, J 5.5 Hz, H-1), 5.47 (dd, 1H, J 11.0 Hz, 5.5 Hz, H-2), 5.46 (d, 1H, J 3.5 Hz, H-4), 5.04 (dd, 1H, J 11.0 Hz, 3.5 Hz, H-3), 4.17 (t, 1H, J 6.5 Hz, H-5), 4.06 (d, 2H, J 6.5 Hz, H-6a and H-6b), 2.38 (t, 8H, J 7.0 Hz, --COCH2 --), 2.40 (s, 3H, -SAc), 0.87 (t, 15H, J 7.0 Hz, --CH3).

Provenance & Evidence