Sodium Azide → (3R,5S)-5-[(S)-1-Azido-2-benzyloxyethyl]-3-ethyldihydrofuran-2-one

Participants

Reaction Conditions

Reaction Steps

7.91 g of sodium azide (122 mmol) was added to a solution of 29.5 g of methanesulfonic acid (R)-2-benzyloxy-1-[(2S,4R)-4-ethyl-5-oxotetrahydrofuran-2-yl]ethyl ester obtained in Example (106d) (86.3 mmol) in N,N′-dimethylpropyleneurea (300 ml) at room temperature, and the mixture was stirred at 60° C. for two days. The reaction mixture was cooled and then poured into ice water, followed by extraction with diethyl ether. Then, the organic layer was washed with water and brine and dried over anhydrous magnesium sulfate. After filtration, the solvent was evaporated under reduced pressure, and the residue was purified by silica gel column chromatography (elution solvent:n-hexane/ethyl acetate=6/1) to obtain 23.1 g of the title compound (yield: 93%).

Provenance & Evidence