Acetic Acid → HCID 86749427, compound

Participants

Reaction Steps

A mixture of (S)-3-[[1,1-Dimethylethyl)diphenylsilyl]oxy]-4-[[[2-(4-fluorophenyl)-4-(1-methylethyl)-6-phenyl-3-pyridinyl]ethynyl]methoxyphosphinyl]-butanoic acid, methyl ester (750 mg, 1.00 mmol) tetra-n-butylammonium fluoride (1.0M in THF, 3.50 mmol), and HOAc (330 mg, 5.50 mmol) in THF (12 ml) was stirred at room temperature for 15 hours. The solution was partitioned between 5% KHSO4 and EtOAc. The layers were shaken and separated and the EtOAc layer was washed again with 5% KHSO4. The pooled aqueous washings were back-extracted twice with EtOAc. The combined EtOAc layers were washed with brine and dried (Na2SO4). Filtration and removal the solvent afforded a yellow oil. The oil was dissolved in Et2O and treated with excess diazomethane for 20 minutes. The excess diazomethane was destroyed by the addition of HOAc and the solvent was removed in vacuo. The residue was chromatographed (flash, Merck SiO2, 40% acetone in hexane followed by 1:1 acetone:hexane) to afford (S)-4-[[[2-(4-Fluorophenyl)-4-(1-methylethyl)-6-phenyl-3-pyridinyl]ethynyl]methoxyphosphinyl]-3-hydroxybutanoic acid, methyl ester (446 mg, 88%) as a colorless oil.

Provenance & Evidence