Synthesis of Ac-Asp-Gly-Ser and Ac-Asp-Pro-Leu-Gly-NH2

Abstract
The syntheses of Ac-Asp-Gly-Ser and Ac-Asp-Pro-Leu-Gly-NH2 are described. The 2 peptides were prepared in solution by stepwise elongation using the DCC [N,N''-dicyclohexylcarbodiimide] method with additives (HOSu[N-hydroxysuccinamide] or HOBt[1-hydroxybenzotriazole]). The push-pull method was also used in the synthesis of Ac-Asp-Gly-Ser. A racemization test of the amino acids in this peptide was performed. [These are the structures postulated for 2 CNS peptides.].

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