1-(3-bromophenyl)-3-oxabicyclo[3.1.0]hexan-2-one

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: The compound was prepared in an analogous manner as described for intermediate B5A from (3-bromo-phenyl)-diazo-acetic acid allyl ester (intermediate B4B) (8.71 g, 31 mmol). The compound was obtained after silica gel column chromatography with n-heptane/ethyl acetate as light green oil (6.585 g, 84%). MS (ISP): m/z=270.1 [(M+NH4)+] and 272.1 [(M+2+NH4)+]. The compound was prepared in an analogous manner