Tributylstannane → HCID 537259, compound

Participants

Reaction Steps

Ethyl bromodifluoroacetate (6.0 g) and dodecyl aldehyde (1.84 g) were mixed with anhydrous tetrahydrofuran (40 ml) under argon atmosphere, and the solution was added dropwise to a suspension of zinc powder (2.2 g) and copper bromide (I) (0.22 g) in anhydrous tetrahydrofuran (40 ml) which was heated to a refluxing temperature. The mixture, after heating under reflux for 5 hours, was cooled and concentrated under reduced pressure. The residue was subjected to chromatography on a silica gel column with eluent systems of n-hexane-ethyl acetate (from 20:1 to 10:1) to give ethyl 2,2-difluoro-3-hydroxytetradecanoate (0.92 g). After the mixture of ethyl 2,2-difluoro-3-hydroxytetradecanoate (0.92 g) and 1,1'-thiocarbonyl imidazole (1.26 g) in 1,2-dichloroethane was heated under reflux for 1 hour, it was cooled and concentrated. The residue was subjected to chromatography on a silica gel column with eluent systems of n-hexane-ethyl acetate (from 30:1 to 10:1) to give ethyl 2,2-difluoro-3-imidazoylthiocarbonyloxytetradecanoate (1.32 g). To a solution of ethyl 2,2-difluoro-3-imidazoylthiocarbonyloxytetradecanoate (1.32 g) dissolved in toluene (40 ml) under argon atmosphere, which was heated under reflux, was added dropwise a solution of tri-n-butyltin hydride (2.93 ml) in toluene (70 ml). The mixture, after heating under reflux for 2 hours, was concentrated under reduced pressure. The residue was subjected to chromatography on a silica gel column with eluent systems of n-hexane-ethyl acetate (from 300:1 to 50:1) to give ethyl 2,2-difluorotetradecanoate (0.67 g). To a solution of ethyl 2,2-difluorotetradecanoate (489 mg) in N,N-dimethylformamide (30 ml) were added 6-(4'-N-glycyl-spicaminyl-amino)purine hydrochloride (300 mg) and triethylamine (1.5 ml). The mixture was stirred for 12 hours. After the solvent was evaporated, the residue was subjected to chromatography on a silica gel column with eluent systems of chloroform-methanol-water (from 8.5:1:0.05 to 7:1:0.05) to give SPK182 in the yield of 95 mg.

Provenance & Evidence