N-ε-Boc-L-lysine methyl ester hydrochloride is a protected, esterified lysine derivative in which the ε-amino group is carbamated with a tert-butoxycarbonyl (Boc) protecting group and the carboxyl group is converted to a methyl ester, while the α-amino functionality remains present as part of the hydrochloride salt form. The molecule therefore contains a Boc-protected ε-amino side chain bearing a (CH2)4 chain typical of lysine, along with an α-amino group and a methyl ester carbonyl, and the stereochemistry corresponds to L-lysine as indicated in the name. In peptide and amino acid synthesis workflows, it functions as a stepwise lysine building block that can be incorporated into protected peptide intermediates while the Boc group helps control chemoselectivity at the ε-amino site during coupling and subsequent deprotection steps, and the methyl ester form supports controlled downstream transformations and analytical handling of the intermediate.
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