Hydrochloric Acid → H-Lys(Z)-Leu-Leu-OMe.HCl

Participants

Reaction Conditions

Reaction Steps

A solution of HCl (28 g, 770 mmol) in ethyl acetate (100 g) at −10° C. was rapidly added to Boc-Lys(Z)-Leu-Leu-OMe (35.0 g, 55.74 mmol) under N2 at −15 to −12° C. The mixture was stirred and maintained at −15 to −12° C. for 60 to 70 min and allowed to crystallize for 1 h at −10 to −5° C. The solid was filtered while excluding moisture, washed with several portions of t-butyl methyl ether and dried in vacuo to give H-Lys(Z)-Leu-Leu-OMe.HCl (28.7 g, 91.4%).

Provenance & Evidence