Abstract
Small peptides are often endowed with useful biological activity and two of these are l-leucyl-l-leucine methyl ester (1) and glycyl-l-glutamine (2). To advance research in this important area, they were tritiated at high specific activity. [3H] l-Leucyl-l-leucine methyl ester (5) was prepared by the reaction of [3H] l-leucine methyl ester (4) with BOC-Leu-OSu. [3H] Glycyl-l-glutamine (7) was synthesized by the reaction of [3H] l-glutamine with BOC-Gly-OSu. Biosynthesized from l-lysine and l-methionine, related small molecule l-propionylcarnitine taurinamide (3) was also tritiated, employing [3H] taurine (10) and l-propionylcarnitine acid chloride (9).
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