Acetic acid, 2-(triphenylphosphoranylidene)-, methyl ester → HCID 5312382, compound

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Reaction Steps

To trans-2-decenal (5.0 g) dissolved in methylene chloride (80 ml) was added (carbomethoxymethylene)-triphenylphosphorane (11.99 g), and the mixture was stirred for 2 hours. The reaction mixture was subjected to chromatography on a silica gel column with eluent systems of n-hexane-ethyl acetate (from 100:1 to 20:1) to give the methyl ester of trans,trans-2,4-dodecadienoic acid (6.1 g). Potassium hydroxide (8.1 g) was dissolved in a mixed solvent of ethanol-water (1:1) (100 ml). The methyl ester of trans,trans-2,4-dodecadienoic acid (6.1 g) was added to the mixture, and the resulting mixture was stirred at 60° C. for 40 minutes. After the reaction mixture was cooled, it was adjusted to the weak acidic range of pH with citric acid and extracted with ethyl acetate. The ethyl acetate layer was dried over anhydrous sodium sulfate and concentrated to give trans,trans-2,4-dodecadienoic acid (5.4 g). To trans,trans-2,4-dodecadienoic acid dissolved in N,N-dimethylformamide (DMF, 50 ml) were added para-nitrophenol (3.8 g) and N,N'-dicyclohexylcarbodiimide (5.8 g), and the mixture was stirred for 12 hours. After precipitates obtained were removed by filtration and the solvent (DMF) was removed by distillation, the residue was subjected to chromatography on a silica gel column with eluent systems of n-hexane-ethyl acetate (from 200:1 to 50:1) to give the active ester of trans,trans-2,4-dodecadienoic acid (3.4 g). To the active ester (800 mg) dissolved in DMF (30 ml) were added 6-(4'-N-glycyl-spicaminyl-amino)purine hydrochloride (800 mg) and triethylamine (2.0 ml). The mixture was stirred for 12 hours. After the solvent was removed by distillation, the residue was subjected to chromatography on a silica gel column with eluent systems of chloroform-methanol (from 7:1 to 5:1) to give SPK282 in the yield of 310 mg.

Provenance & Evidence