Benzyl Alcohol → L-Glutamic acid, 5-(phenylmethyl) ester

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Glutamic acid (20 g, 0.14 mol, 1 equiv), BnOH (21.1 mls, 0.20 moles, 1.5 equiv) were dissolved in of toluene (30 ml) with stirring in a three necked RB flask. To the resultant mixture methanesulphonic acid (10.6 ml, 0.16 mol, 1.2 equiv) was added slowly whilst maintaining the temperature of the mixture at 45° C. Stirring was continued at this temperature for 2 hrs following which the mixture was cooled to 30° C. and stirred for an additional 4 hrs. Water (50 ml) was then added to the mixture and the organic phase was separated. To the aqueous phase ethanol (30 ml) was added followed by cold aq. ammonia to obtain a pH of 6.5-7. At this point a thick white precipitate was formed which could either be heated to 60° C. and stirred for 2 hrs to improve the crystallinity and then cooled to 5-10° C. or filtered at this point and washed with ethanol (2×20 ml) and water (3×20 ml). The product is then allowed to dry and used without further purification (3.45 g, 21%).

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