Sodium Sulfate → HCID 86635360, compound

Participants

Reaction Steps

The crude 7-fluoro-2-oxo-1-(2-oxoethyl)-1,2-dihydro-4-quinolinyl trifluoromethanesulfonate (5.6 g, 15.9 mmol assumed 100% from previous step) was dissolved in THF (50 ml) and 1,1-dimethylethyl (2,3-dihydro[1,4]dioxino[2,3-c]pyridin-7-ylmethyl)-4-piperidinylcarbamate (for a synthesis see WO2004/058144 Example 99(h)) (5.60 g, 15.9 mmol) added followed by sodium sulphate (˜15 g). After 2 h sodium triacetoxyborohydride (12.3 g, 58 mmol) was added portionwise over 1 h and the solution stirred for 18 h. The solution was diluted with ethyl acetate and washed with sodium bicarbonate solution, dried and concentrated. Chromatography (70 g silica SPE, eluting with ethyl acetate) provided product (4.88 g) contaminated with an impurity. Further chromatography (70 g silica SPE gradient elution with 2:1 ethyl acetate/hexane to ethyl acetate to ethyl acetate/10% methanol) provided the title compound as a clear oil (2.81 g, 26%).

Provenance & Evidence