Sulfuric Acid → HCID 57435159, compound

Participants

Reaction Steps

Crude 4-Nitro-1-phenyl-pentan-3-ol (179) from above was dissolved in CH2Cl2 (60 mL) and cooled in an ice bath under nitrogen. Concentrated sulfuric acid (0.76 mL, 14.2 mmol) then acetic anhydride (13.83 mL, 146.2 mmol) were added slowly, and the reaction was allowed to warm to room temperature, and was stirred until judged complete by HPLC (3 h, 40 min). (Note: The reaction turned black soon after the addition of the acetic anhydride.) The reaction was quenched by pouring slowly into water, then the organic layer was removed, washed with aq. NaHCO3, dried, filtered, and concentrated. The crude product was purified by purified by silica gel chromatography (Combiflash column, 95:5 Hexanes: EtOAc) to achieve pure 180 (21.4447 g, 65.5%, 2 steps). HPLC: 10.45 min.

Provenance & Evidence