Triphenylphosphine → HCID 56623486, compound

Participants

Reaction Steps

Analogously to Example 24, 0.12 ml of thionyl chloride and then 0.23 ml of triethylamine in 0.23 ml of absolute tetrahydrofuran are added to a solution of 606 mg of 2-[(3S,4R)-4-p-nitrobenzyloxycarbonylaminobutyrylthio)-3-methoxy-2-oxoazetidin-1-yl]-2-hydroxyacetic acid p-nitrobenzyl ester in 4.5 ml of absolute tetrahydrofuran. After reacting and working up, 0.54 g of triphenylphosphine is added to the resulting crude 2-[(3S,4R)-4-(4-p-nitrobenzyloxycarbonylaminobutyrylthio)-3-methoxy-2-oxoazetidin-1-yl]-2-chloroacetic acid p-nitrobenzyl ester in 1.15 ml of absolute tetrahydrofuran. Working up and chromatography over silica gel produce the title compound with the following IR spectrum (CH2Cl2): characteristic absorption bands at 5.7, 5.78, 5.9, 6.15, 6.55, 7.45 and 8.26μ.

Provenance & Evidence