T. Furuta et al., DIRECT ESTERIFICATION OF PHOSPHATES WITH VARIOUS HALIDES AND ITS APPLICATION TO SYNTHESIS OF CAMP ALKYL TRIESTERS, Journal of the Chemical Society. Perkin transactions. I, (24), 1993, pp. 3139-3142
Esterification of phosphates with various halides, including acid chlo
rides, phosphoryl trichloride and tin chloride, was achieved in 57-99%
isolated yield using silver(I) oxide. The reaction was successfully a
pplied to the preparation of phosphate triesters sensitive to acids an
d bases. cAMP benzyl esters were also prepared by this method.