Abstract
A method for the synthesis of 6-O-benzyl- and 6-O-benzyl-2-N-benzyloxycarbonyl-protected guanine derivatives starting from 2-amino-6-chloropurin is described. A regioselective alkylation of these N(9)-protected guanine derivatives gave the corresponding α-monomers of chiral peptide nucleic acids, the L-glutamic acid derivatives. It was shown that these compound do not inhibit (in the concentrations <20 µmol L–1) the topoisomerase I activity.
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