反应详情

6.1 g (17.4 mmol) of 7-acetoxy-4-bromomethyl-2-formylaminohept-3-enoic acid ethyl ester and 19.1 ml (69.6 mmol) of triisopropyl phosphite (90%) are heated to 80° C. and stirred under a pressure of approximately 130 mbar for 18 hours. The excess triisopropyl phosphite is distilled off and the residue is purified on silica gel with ethyl acetate. 7-acetoxy-4-diisopropylphosphonomethyl-2-formylamino-hept-3-enoic acid ethyl ester is obtained in the form of a yellow oil.

1. distillationThe excess triisopropyl phosphite is distilled off
2. customthe residue is purified on silica gel with ethyl acetate