Chlorotrimethylsilane → HCID 18403062, compound

Participants

Reaction Conditions

Reaction Steps

Benzylphosphinic acid (2.3 g, 15 mmol) in 150 mL of dry dichloromethane was cooled to 0° C. under a nitrogen atmosphere. Triethylamine (6.5 g, 65 mmol) was added followed by trimethylsilyl chloride (5.8 g, 54 mmol) while the reaction temperature was maintained at 0° C. After 30 minutes dibenzyl 2-methylene-pentanedioate (2) (4.4 g, 13.6 mmol) in 20 mL of dichloromethane was added over 5 minutes. The reaction mixture was allowed to warm to room temperature and stirred overnight. The clear solution was cooled to 0° C. and quenched with 5% hydrochloric acid followed by removal of the organic layer. The organic layer was washed with 5% hydrochloric acid and with brine, dried (MgSO4) and evaporated to give a clear yellow liquid. Purification by flash chromatography and elution with 1:1 hexane/ethyl acetate containing 10% acetic acid yielded 2.0 g (28%) of benzyl[2,4-di(benzyloxycarbonyl)butyl]-phosphinic acid (3, R=CH2Ph, R1 =H) as a clear light yellow oil. Rf 0.37 (1:1 Hexane/EtOAc, 10% AcOH).

Provenance & Evidence