tert-Butyl N-allyl-N-[2-hydroxyimino-2-phenyl-ethyl]carbamate → tert-Butyl 6a-phenyl-3,3a,4,6-tetrahydro-1H-pyrrolo[3,4-c]isoxazole-5-carboxylate

Participants

Reaction Conditions

Reaction Steps

A solution of tert-butyl N-allyl-N-[-2-hydroxyimino-2-phenyl-ethyl]carbamate as a mixture of E and Z isomers (3.2 g, 10.9 mmol) in xylene (100 mL) is stirred at 100° C. for 2 hours, 130° C. for 6 hours, 100° C. for 12 hours and 130° C. for 2 hours. The cooled reaction is concentrated under reduced pressure to give a residue. The residue is purified by silica gel flash chromatography, eluting with hexane/ethyl acetate (1:0) to hexane/ethyl acetate (0:1) to give the title compound (1.5 g, 48%). ES/MS (m/e): 291 (M+H).

Provenance & Evidence