Hydrochloric Acid → HCID 88760778, compound

Participants

Reaction Steps

To a solution of 5.8 g of benzyl α-(3ξ-carboxy-2-benzoyl-7-oxo-4-oxa-2,6-diazabicyclo[3.2.0]heptan-6-yl)-α-isopropylideneacetate dissolved in a mixture of 70 ml of benzene and 0.14 ml of N,N-dimethylformamide is added 1.33 ml of oxalyl chloride at room temperature under nitrogen atmosphere, and the mixture allowed to stand for 30 minutes, and concentrated to 1/2 volume. The resulting solution of benzyl α-(3ξ-chlorocarbonyl-2-benzoyl-7-oxo-4-oxa-2,6-diazabicyclo[3.2.0]heptan-6-yl)-α-isopropylidene-acetate is mixed under ice-cooling with an ether solution of diazomethane prepared from 4 g of N-nitrosomethylurea. The resulting solution of benzyl α-(3ξ-diazoacetyl-2-benzoyl-7-oxo-4-oxa-2,6-diazabicyclo[3.2.0]heptan-6-yl)-α-isopropylideneacetate is mixed with 2.1 ml of ether containing 0.47 g of hydrogen chloride at 0° C., and after 2 hours, evaporated to yield 6.3 g of benzyl α-(3ξ-chloroacetyl-2-benzoyl-7-oxo-4-oxa-2,6-diazabicyclo-[3.2.0]heptan-6-yl)-α-isopropylideneacetate as an yellow-brown oil.

Provenance & Evidence