Cyclohexene → Diethyl 2-hydroxyethoxymethanephosphonate

Participants

Reaction Steps

The method of claim 1 wherein in step (a) a solution of (i) the diethyl ester of hydroxymethylphosphonic acid and (ii) 2-benzyloxyethyl p-toluene sulfonate in ethylene glycol dimethyl ether is added to a slurry of sodium hydride in ethylene glycol dimethyl ether under a nitrogen atmosphere to form diethyl 2-(benzyloxy)ethoxymethylphosphonate as a first intermediate; wherein, in step (b), said first intermediate is dissolved together with cyclohexene in ethanol, paladium on carbon is added to the ethanol solution, and the resulting slurry is heated under nitrogen to form diethyl 2-hydroxyethoxymethylphosphonate as a second intermediate; wherein in step(c), said second intermediate is dissolved in dichloromethane under a nitrogen atmosphere, toluene sulfonyl chloride is added to the dichloromethane solution, and a solution of pyridine in dichloromethane is added to the resulting mixture to form diethyl 2-(phosphonomethoxy)ethyl p-toluene sulfonate as a third intermediate; and wherein in step (d), said third intermediate is dissolved together with the diethyl ester of hydroxymethylphosphonic acid in ethylene glycol dimethyl ether, and a slurry of sodium hydride in ethylene glycol dimethyl ether is added thereto under a nitrogen atmosphere to form tetraethyl ethyleneglycol di-(phosphonomethyl) ether.

Provenance & Evidence