Method B. Methyl carbobenzoxy-L-prolyl-L-leucinate (3.8 g.) was dissolved in methanol (15 ml.). Normal sodium hydroxide (10.5 ml.) was added and the resulting solution was stirred at room temperature for 2 hr. The solution w3s then acaidified by the slow addition of concentrated hydrochloric acid. Methanol was removed in umuo. The crystalline product was filtered off and was washed with water; wt. 3.6 g., mp 136-138'. This material was ...
