Cesium carbonate → (R)-tert-butyl (3-hydroxy-3-(3-((tetrahydro-2H-pyran-4-yl)methoxy)phenyl)propyl)carbamate

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Reaction Steps

Cs2CO3 (2.34 g, 7.18 mmol) was added to a solution of (tetrahydro-2H-pyran-4-yl)methyl methanesulfonate (1.05 g, 5.41 mmol) and Intermediate I (1.13 g, 4.23 mmol) in anhydrous DMF (11 mL) and the reaction mixture was heated at +70° C. under Ar for 22 hrs. Aqueous NH4Cl (25%) was added and the reaction mixture was extracted with MTBE twice. Combined organic layers were washed with brine, concentrated under reduced pressure. Purification by flash chromatography (25%-100% EtOAc-hexanes gradient) gave (R)-tert-butyl (3-hydroxy-3-(3-((tetrahydro-2H-pyran-4-yl)methoxy)phenyl)propyl)carbamate as a colorless oil. Yield (0.47 g, 30%); 1H NMR (400 MHz, DMSO-d6) δ 7.18 (t, J=8.0 Hz, 1H), 6.85-6.84 (m, 2H), 6.76-6.74 (m, 2H), 5.15 (d, J=4.4 Hz, 1H), 4.49 (q, J=4.4 Hz, 1H), 3.88-3.84 (m, 2H), 3.79 (d, J=6.4 Hz, 2H), 2.94 (q, J=6.4 Hz, 2H), 1.70-1.62 (m, 4H), 1.38-1.26 (m, 11H).

Provenance & Evidence