Triethylamine → HCID 19434030, compound

Participants

Reaction Steps

To a solution of the product from Example 7, Step B (1.02 g, 2.79 mmol) and triethylamine (0.84 g, 8.36 mmol) in anhydrous THF (50 mL) was added methanesulfonic anhydride (0.80 g, 4.18 mmol) with stirring under nitrogen. The volatiles were evaporated after 30 min and the residue dissolved in ethyl acetate (80 mL). This mixture was washed with a saturated aqueous solution of sodium bicarbonate (50 mL), dried (MgSO4) and evaporated to give a solid. The solid (1.55 g from two batches) was dissolved in a mixture of anhydrous DMF (40 mL) and 1-propylamine (6 mL) and heated at reflux temperature for 1 h followed by evaporation to a residue which was added to a saturated aqueous solution of sodium bicarbonate (100 mL). This mixture was extracted with ethyl acetate (2×100 mL) and the combined extracts were dried (MgSO4) and evaporated to an oil which was purified by column chromatography (silica, 6% methanol/methylene chloride) to give a viscous oil (1.17 g, 84%).

Provenance & Evidence