78008-36-3

General procedure for the synthesis of (R)-1,4-dioxaspiro[4,5]decane-2-carbaldehyde from 1,2:5,6-di-O-cyclohexylidene-D-mannitol: a solution of sodium meta-periodide (NaIO4, 7.3 g, 34 mmol) and tetrabutylammonium bromide (phase transfer catalyst, 0.2 g, 0.62 mmol) in water (60 mL) was slowly added to a solution of 1,2. 5,6-di-O-cyclohexylidene-D-mannitol (10.0 g, 29.3 mmol) to a solution of tetrahydrofuran (THF, 100 mL). The reaction mixture was stirred at room temperature for 3 hours. After completion of the reaction, the organic layer was separated and the aqueous layer was extracted with ether (3 x 35 mL). The combined ether extracts were washed with water (1 x 35 mL) and dried with anhydrous sodium sulfate. The solvent was removed by evaporation under reduced pressure to give a colorless viscous liquid (R)-1,4-dioxaspiro[4,5]decane-2-carboxaldehyde (compound (R)-8) in 90% yield (8.94 g).

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