A convenient method for the synthesis of phenylmethyl N‐methyl (carboxy‐14C) glycine hydrochloride (Z) is described. It involves the carboxylation of transmetalated organostannane compound 4 which itself is accessible by established procedure. Success in preparing the labelled amino acid Z enabled us to synthesize target N‐glycyl‐N‐methyl(carboxy‐14C) glycine (10) by conventional coupling protocol.
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Ekhato et al. (1994) studied this question.
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