Monosodium phosphate → (E)-10-heptyloxy-1-((S)-4-isopropyl-5,5-diphenyl-2-thioxo-oxazolidin-3-yl)-dec-3-en-1-one

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Reaction Conditions

Reaction Steps

Under a nitrogen atmosphere, (E)-10-heptyloxy-dec-3-enoic acid obtained in Step C-3 (209.7 mg, 0.698 mmol) and a commercially available reagent of (S)-4-isopropyl-5,5-diphenyl-oxazolidine-2-thione (207.5 mg, 0.698 mmol) were dissolved in dichloromethane (3.13 mL), and the mixture was cooled to 0° C. While maintaining the temperature at 0° C., N,N-dimethyl-4-aminopyridine (8.5 mg, 0.0698 mmol) and WSCl (173.9 mg, 0.907 mmol) were added in order. The mixture was stirred at 0° C. for 2.0 minutes and at room temperature for 16 hours. To the reaction solution was added an aqueous solution (4.2 mL) of 10% sodium dihydrogen phosphate and the mixture was extracted with ethyl acetate. The organic layer was washed with water and a saturated brine in order, dried over anhydrous sodium sulfate, and filtered. The solvent was distilled off. The resulting residue was then purified with SP1 (SiO2 cartridge, 10% ethyl acetate/n-hexane, Rf=0.6) to obtain (E)-10-heptyloxy-1-((S)-4-isopropyl-5,5-diphenyl-2-thioxo-oxazolidin-3-yl)-dec-3-en-1-one (No. 6804254; 336.2 mg, 3 steps, 75% yield).

Provenance & Evidence