Diisopropylamine → Methyl 3,4,6-tri-O-acetyl-2-deoxy-2-phthalimido-1-thio-beta-D-galactopyranoside

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Reaction Steps

A mixture of 1,3,4,6-tetra-O-acetyl-2-deoxy-2-phthalimido-β-D-galactose (680 mg, 1.425 mmol), methylthiotrimethylsilane (0.8 ml, 5.64 mmol), and trimethyl silyl triflate (0.32 ml, 1.66 mmol) in CH2Cl2 was stirred at room temperature for 2 days. Diisopropylamine (~1 ml) was added, diluted with CH2Cl2 (~50 ml) and washed with saturated NaHCO3 solution and water, respectively. The organic layer was dried (Na2SO4) and evaporated to dryness. Column chromatography (heptane-EtOAc) gave pure 20 (630 mg, 95%) as an amorphous powder, having [α]D24 +25° (c1, CHCl3).

Provenance & Evidence