alpha-Chlorohydrin, (+)- → 3-[4-((S)-2,3-dihydroxy-propoxy)-3,5-dimethyl-phenyl]-1-(5-ethyl-4-p-tolyl-thiophen-2-yl)-propan-1-one

Participants

Reaction Conditions

Reaction Steps

A solution of 1-(5-ethyl-4-p-tolyl-thiophen-2-yl)-3-(4-hydroxy-3,5-dimethyl-phenyl)-propan-1-one (47 mg, 0.125 mmol) in ethanol (2 mL) and 3 N aq. NaOH (0.5 mL) is treated with (S)-3-chloro-propane-1,2-diol (90 μL) and the mixture is stirred at 60° C. for 20 h. Another portion of (S)-3-chloro-propane-1,2-diol (60 μL) is added and stirring is continued at 60° C. for 5 days. The reaction mixture is diluted with water and extracted with DCM. The solvent of the organic extract is evaporated and the crude product is purified on prep. TLC plates with heptane:EA 2:1 to give 3-[4-((S)-2,3-dihydroxy-propoxy)-3,5-dimethyl-phenyl]-1-(5-ethyl-4-p-tolyl-thiophen-2-yl)-propan-1-one (6 mg) as a colourless resin; LC-MS: tR=1.05 min, [M+1]+=453.25; 1H NMR (CDCl3): δ 7.56 (s, 1H), 7.30-7.21 (m, 4H), 6.88 (s, 2H), 4.11-4.05 (m, 1H), 3.87-3.80 (m, 4H), 3.18-3.11 (m, 2H), 2.98-2.85 (m, 4H), 2.39 (s, 3H), 2.25 (s, 6H), 1.29 (t, J=7.6 Hz, 3H).

Provenance & Evidence