Benzyl Bromide → N-(3-carboxy-3-hydroxy-3-phosphonopropyl)-N,N-dimethyl-N-(phenylmethyl)ammonium bromide

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Reaction Steps

A solution of 2.27 g (0.01 mole) of 4-(N,N-dimethylamino)-2-hydroxy-2-phosphonobutanoic acid (prepared as described in Method 1) in 10 ml water and 40 ml ethanol is adjusted to pH 7.0 by addition of IN aqueous NaOH. To this is added 5.13 g (0.03 mole) of benzyl bromide, and the reaction is heated at about 50° for one day. The reaction is evaporated to dryness under reduced pressure. The resulting residue is slurried in water and the mixture is extracted several times with CHCl3. The aqueous solution is evaporated a little to get rid of traces of chloroform, and is treated with cation ion exchange resin in H+ form. The resin is filtered off, the aqueous solution is concentrated to a few ml, and ethanol is added dropwise to precipitate the product. This is purified by recrystallization from water/ethanol to give N-(3-carboxy-3-hydroxy-3-phosphonopropyl)-N,N-dimethyl-N-(phenylmethyl)ammonium bromide.

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