N-t-butoxycarbonyl-L-tyrosylglycylglycyl-L-phenylalanine benzyl ester → N-t-butoxycarbonyl-L-tyrosylglycylglycyl-L-phenylalanine

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Reaction Steps

To a solution of 3.6 parts N-t-butoxycarbonyl-L-tyrosylglycylglycyl-L-phenylalanine benzyl ester in 160 parts methanol is added 0.4 part palladium black metal catalyst. The resulting mixture is shaken with hydrogen at room temperature at atmospheric pressure for about 5 hours. The catalyst is then removed by filtration, and the solvent removed by evaporation under reduced pressure. The resulting crude material is purified using low-pressure chromatography to afford N-t-butoxycarbonyl-L-tyrosylglycylglycyl-L-phenylalanine.

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