反应详情

A solution of 13.3 g of O-methyl homoserine in 370 ml of methanol and 180 ml of a 6 N solution of hydrogen chloride in dioxane is allowed to stand at room temperature for 3 to 4 days. The solvent is removed under reduced pressure and the residue lyophilized to give O-methyl homoserine methyl ester hydrochloride which is represented by the following formula ##STR51## Substitution of an equivalent quantity of O-methyl homoserine methyl ester hydrochloride for the methyl D-methioninate hydrochloride of Example 35 and substantial repetition of the procedures described in Examples 35 through 39 provides methyl DL-2,6-dimethyltyrosyl-DL-O-methylhomoseryl-glycyl-L-phenylalanyl-3-amino-1-adamantanecarboxylate hydrochloride which is represented by the following formula ##STR52##

1. customThe solvent is removed under reduced pressure