Phosphorochloridic acid, dimethyl ester → HCID 13366880, compound

Participants

Reaction Conditions

Reaction Steps

3-[(Phenylacetyl)amino]-2-azetidinone (250 mg)was dissolved in a mixture of dry dimethylformamide (2 ml) and anhydrous tetrahydrofuran (5 ml). The mixture was cooled to -78° C., sec-butyllithium (0.83 ml of 1.4 N in cyclohexane) was added, stirring was continued for 8 minutes dimethylphosphorochloridate (187 μl) was added, and the mixture was stirred for 45 minutes at -78° C. After dilution with saturated aqueous sodium chloride and two extractions with ethyl acetate, the combined extracts were dried (sodium sulfate), filtered, and solvent was removed in vacuo yielding an oil. Thin-layer chromatography on plates developed in ethyl acetate gave the product as an oil which crystallized from ether. The solid was recrystallized from ethyl acetateether-pentane, triturated with ether, and dried in vacuo yielding 283 mg of the title compound as a powder, melting point 77.5°-81.5° C.

Provenance & Evidence