Ammonium Chloride → (3R,4S,5S,6R)-3,4,5-Trisbenzyloxy-6-benzyloxymethyl-2-[3-(5-fluorobenzo[b]thiophen-2-ylmethyl)naphthalen-1-yl]tetrahydropyran-2-ol

Beteiligte Stoffe

Reaktionsschritte

In a nitrogen stream, an n-butyllithium hexane solution (1.6 M, 0.97 ml, 1.55 mmol) was added dropwise to a solution of 2-(4-bromonaphthalen-2-yl-methyl)-5-fluorobenzo[b]thiophene (520 mg, 1.41 mmol) in THF (15 ml) at −78° C. and the reaction mixture was stirred at the same temperature for 10 minutes. To this solution, a solution of 3,4,5-trisbenzyloxy-6-benzyloxymethyl-tetrahydropyran-2-one (835 mg, 1.55 mmol) in THF (3 ml) was added dropwise. The mixture was stirred at −78° C. for one hour, and a saturated ammonium chloride aqueous solution was added thereto to stop the reaction. The reaction mixture was extracted with ether, and the organic layer was washed with a saturated sodium chloride aqueous solution and dried (anhydrous magnesium sulfate), and then the solvent was distilled under reduced pressure. The obtained residue was purified by silica gel column chromatography [developing solution=ethyl acetate:n-hexane (1:20)] to obtain the title compound (770 mg, 66%).

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