Triethylamine → cis-3-hydroxy-4-phenylazetidin-2-one

Participants

Reaction Steps

To a heterogeneous solution of N-trimethylsilyl-3-trimethylsiloxy-4-phenyl-azetidin-2-one (150 g, 0.49 mol) in methanol (500 mL) was added a catalytic amount of trimethylchlorosilane (1.089, g 1 mmol) and the mixture was stirred at ambient temperature to give a clear solution. Thin layer chromatography (TLC) monitoring of the reaction eluting with ethyl acetate and hexanes (3:1) indicated that complete conversion was achieved after 15 minutes. The reaction mixture was quenched with triethylamine (10.1 g, 0.1 mol) and the methanol was removed under rotary evaporation at 40° C. until crystals formed. Ethyl acetate (300 mL) was added and the evaporation was continued to remove the remaining methanol to give a thick slurry before cooling to 0 to 5° C. for 20 minutes. The white crystals were collected via vacuum filtration following by washing with cold 0° C. ethyl acetate (75 mL) and dried to constant weight of 75 g (94% yield) of the desire product described previously.

Provenance & Evidence