Acetic Anhydride → N-(3-diethoxyphosphorylpropyl)-N-hydroxy-acetamide

Participants

Reaction Conditions

Reaction Steps

2.8 g (0.013 mol) 3-(N-hydroxyamino)-propylphosphonic acid diethylester are dissolved in 30 ml methylene chloride and added drop by drop with cooling with ice to 2.65 g (0.026 mol) acetic anhydride. The reaction mixture is stirred for 30 minutes at 0-5° C. and for a further 1.5 hours at room temperature. After concentration under reduced pressure until a yellow oily radical is achieved, this oily residue is taken up in 15 ml methanol and 5 ml water, adjusted to pH 8 with 2 n NaOH and stirred for a further 1.5 hours at room temperature. Methanol is removed under reduced pressure and the resultant solution is adjusted to pH=5 with concentrated HCl. The yellow solution is extracted repeatedly with methylene chloride (1×30 ml, 2×10 ml in each case), the combined CH2Cl2 phases are dried over MGSO4 and the solvent is removed at room temperature under reduced pressure. 3.7 g of a yellow oil are obtained which are freed from adhering volatile substances in the entire diaphragm pump vacuum. 2.78 g yellow oil remain.

Provenance & Evidence