Add time:07/29/2019         Source:sciencedirect.com

Four new N-Fmoc α-amino acids carrying a nucleobase in the side chain were prepared starting from l-glutamic acid. N-Boc-glutamic acid α benzyl ester underwent a radical decarboxylation in the presence of CBrCl3 to give the corresponding 2-amino-4-bromobutanoic acid derivative. The four nucleobases (adenine, cytosine, thymine and guanine) were introduced “via” nucleophilic substitution of the bromide using a different synthetic protocol for each base. The Boc protection was changed to Fmoc and the benzyl ester deprotected to give the four amino acids in good yields and in a suitable form for solid phase peptide synthesis. The preparation of the insecticidal dipeptide NK 374200 is also described.

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