Cesium carbonate → (2S,3R,4R,5S,6R)-2-(4-chloro-3-(4-(3-cyclopropylprop-2-ynyloxy)benzyl)phenyl)-6-(hydroxymethyl)tetrahydro-2H-pyran-3,4,5-triol

Participants

Reaction Steps

To a stirred solution of (2S,3R,4R,5S,6R)-2-(4-chloro-3-(4-hydroxybenzyl)phenyl)-6-(hydroxymethyl)tetrahydro-2H-pyran-3,4,5-triol (intermediate D1) (20 mg, 0.0526 mmol) in 1 mL of DMF was added Cs2CO3 (21 ng, 0.063 mmol) and 3-cyclopropylprop-2-ynyl 4-methylbenzenesulfonate (intermediate AU) (20 mg, 0.079 mmol) at room temperature. After stirring for 2 h, the reaction was quenched with 1 mL of ice water. The mixture was extracted 3× with ethyl acetate (5 mL each). The combined organic layers were washed 2× with water (5 mL each) and brine prior to drying over Na2SO4. Concentration of the solution and purification of the crude product by preparative LC-MS afforded compound AV (10 mg). 1H NMR (CD3OD): δ 7.37˜7.34 (2H, m), 7.30˜7.28 (1H, dd, J=8.8, 2 Hz), 7.13˜7.11 (2H, d, J=8.8 Hz), 6.87˜6.83 (2H, d, J=8.8 Hz), 4.61 (2H, d, J=2 Hz), 4.11 (1H, d, J=9.2 Hz), 4.10˜4.04 (2H, dd, J=23.6, 14.8 Hz), 3.90˜3.87 (1H, m), 3.72˜3.68 (1H, m), 3.49˜3.39 (3H, m), 3.31˜3.28 (1H, m), 1.31˜1.24 (1H, m), 0.79˜0.75 (2H, m), 0.62˜0.59 (2H, m).

Provenance & Evidence