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A facile procedure for the preparation of amino-protected amino acid activated ester was studied. Dimethylaryloxyformimidium chloride (V), which was easily prepared from aryl chloroformate (II) and dimethylformamide under the evolution of carbon dioxide, was allowed to react with amino-protected amino acids to give the corresponding activated aryl esters.
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Masumi Itoh (1970) studied this question.
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