Acetic Acid → HCID 25132791, compound

Participants

Reaction Steps

To a solution of Compound 314 (0.38 g), 30% aqueous paraformaldehyde (0.8 mL) and acetic acid (60 μL) in THF was added sodium triacetoxyboronhydride (0.42 g). After stirring at room temperature for two hours, the THF was removed by evaporation under reduced pressure. The residue was partitioned between saturated aqueous NaHCO3 and EtOAc. The organic phase was dried over anhydrous Na2SO4, filtered and evaporated to dryness. The residue was purified by column chromatography with 10% to 60% MeOH in DCM. The combined pure fractions were evaporated to give a white solid, which was triturated in EtOAc/DCM (2:1) and filtered. The filtrate was evaporated to dryness under reduced pressure. The resulting residue was extracted between water and DCM. The organic phase was dried over anhydrous Na2SO4 and evaporated to give Compound 317 (0.31 g). 1H-NMR (400 MHz, CDCl3) δ: 1.27 (s, 9H), 1.90 (br, 2H), 2.47 (s, 3H), 2.79 (d, J=4.8 Hz, 3H), 3.04 (br, 2H), 4.16 (br, 2H), 4.29 (d, J=9.5 Hz, 1H), 4.32 (br, 2H), 5.95 (br, 1H), 7.20-7.23 (dd, J=2.0, 9.6 Hz, 1H), 7.47-7.53 (m, 5H), 7.82 (d, J=9.5 Hz, 1H). LCMS (+ESI) m/z 398.2 [M+H]+.

Provenance & Evidence