tert-Butyl Dimethylphosphonoacetate → HCID 131736285, compound

Participants

Reaction Conditions

Reaction Steps

Potassium t-butoxide (8.66 g) was dissolved in tetrahydrofuran (50 mL) under a nitrogen atmosphere, and the solution was then cooled to approximately 5° C. Tert-butyl (dimethoxyphosphoryl)acetate (17.30 g) was added thereto at 15° C. or lower, and the mixture was stirred at 5 to 15° C. for 1 hour. (1R,5S)-3-Ethylbicyclo[3.2.0]hept-3-en-6-one (10.00 g) and tetrahydrofuran (25 mL) were further added thereto, and the mixture was stirred at 5 to 15° C. for 1.5 hours. Potassium t-butoxide (0.90 g) and tert-butyl(dimethoxyphosphoryl)acetate (1.73 g) were further added thereto, and the mixture was stirred for approximately 1 hour. Then, the reaction mixture was separated into aqueous and organic layers by the addition of toluene (85 mL) and water (40 mL). The organic layer was washed twice with water (20 mL) and then concentrated under reduced pressure to obtain tert-butyl [(1R,5S)-3-ethylbicyclo[3.2.0]hept-3-en-6-ylidene]acetate (23.09 g) as a yellow oil.

Provenance & Evidence