4-Methylmorpholine → methyl Boc-phenylalanyl-3-amino-1-adamantanecarboxylate

Participants

Reaction Conditions

Reaction Steps

5.09 Grams of Boc-L-phenylalanine is dissolved in 25 ml of dry dimethylformamide and 2.13 ml of N-methylmorpholine is added. The reaction mixture is cooled to -50° C. and 2.51 ml of isobutylchloroformate is added. The reaction mixture is stirred for 15 minutes, then 1.77 ml of N-methylmorpholine and 3.93 g of methyl 3-amino-1-adamantanecarboxylate hydrochloride are added and the reaction mixture is stirred until all the methyl 3-amino-1-adamantanecarboxylate dissolves then stored for 3 days at 5° C. The reaction mixture is poured into 100 ml of water and extracted twice with 50 ml of ethyl acetate. The ethyl acetate fractions are washed twice with 50 ml of water, 50 ml of a 0.5 solution of potassium bisulfate, 50 ml of water, 50 ml of a 0.5 M solution of potassium bicarbonate, and 50 ml of water then dried over magnesium sulfate. The solvent is removed under reduced pressure, and the residue is dissolved in 150 ml of 10% chloroform in hexane and purified by low pressure chromatography on silica gel using a gradient of 10% to 50% solution of chloroform in hexane as eluent. Removal of the solvent under vacuum gives the product methyl Boc-L-phenylalanyl-3-amino-1-adamantanecarboxylate which is represented by the following formula ##STR23##

Provenance & Evidence