Hydrogen Peroxide → 2-Oxaspiro[3.5]nonane-7-methanol

Participants

Reaction Steps

To a 25 mL round-bottomed flask was added EXAMPLE 351E (568 mg) and EXAMPLE 351F tetrahydrofuran (4.11 mL) to give a colorless solution. 9-Borabicyclo[3.3.1]nonane (0.5 M in tetrahydrofuran, 24.7 mL) was added and the reaction was allowed to stir for 2 hours at room temperature. Ethanol (11 mL) was added followed by aqueous NaOH (5M, 4.11 mL) and then hydrogen peroxide (2.1 mL) was added. The reaction was heated at 50° C. for 2 hours. The mixture was concentrated by rotary evaporation, and diluted with water and ethyl acetate. The aqueous layer was extracted with ethyl acetate (3×) and the combined organics were dried (Na2SO4), filtered and concentrated by rotary evaporation. The residue was purified by regular phase flash column chromatography (Analogix, 80 g Grace, 0-70% hexanes/ethyl acetate).

Provenance & Evidence