1-(5-Ethyl-4-phenyl-thiophen-2-yl)-ethanone → 3-[4-(2,3-Dihydroxy-propyl)-3,5-dimethyl-phenyl]-1-(5-ethyl-4-phenyl-thiophen-2-yl)-propan-1-one

Beteiligte Stoffe

Reaktionsschritte

A solution of 4-(2,3-dihydroxy-propyl)-3,5-dimethyl-benzaldehyde (64 mg, 0.308 mmol) and 1-(5-ethyl-4-phenyl-thiophen-2-yl)-ethanone (50 mg, 0.218 mmol) in ethanol (2 mL) and 5 N HCl in isopropanol (0.5 mL) is stirred at rt for 5 days. The solvent is removed in vacuo and the residue is separated by prep. HPLC. Product containing fractions are treated with sat. aq. NaHCO3 and 3 M aq. NaOH (5 mL). The mixture is stirred at rt for 1 h, then extracted with DCM. The solvent of the organic extract is removed. The residue is dissolved in THF:methanol 1:1 (5 mL) and is treated with Pd/C. The slurry is stirred at it for 16 h under 1.5 bar of H2. The mixture is filtered over celite and the filtrate is evaporated to give 3-[4-(2,3-dihydroxy-propyl)-3,5-dimethyl-phenyl]-1-(5-ethyl-4-phenyl-thiophen-2-yl)-propan-1-one (20 mg) as a colourless oil, LC-MS: tR=1.04 min, [M+1]+=423.28.

Herkunft & Nachweise