Sodium Hydroxide → HCID 54048888, compound

Participants

Reaction Conditions

Reaction Steps

21.1 Parts N-t-butoxycarbonyl-L-tyrosylglycylglycyl-L-tryptophyl-L-methionine benzyl ester is dissolved in 70 parts methanol and the solution cooled to 10° C. Then, 90 parts by volume of 1 N sodium hydroxide solution is added dropwise with stirring while maintaining the temperature below 20° C. After standing at room temperature for 1 hour, the methanol is removed by evaporation under reduced pressure. The solution is washed once with ethyl ether to remove benzyl alcohol and the aqueous layer acidified with 90 parts by volume 1 N hydrochloric acid. The solid which results is filtered and washed with water to afford N-t-butoxycarbonyl-L-tyrosylglycylglycyl-L-tryptophyl-L-methionine.

Provenance & Evidence