Boc- or Z-amino acids were conveniently amidated at room temperature by a one-pot procedure employing ammonium hydrogencarbonate and N-ethoxycarbonyl-2-ethoxy-1,2-dihydroquinoline in yields of 81–96%. The benzyl ester-type protector for the side chains of aspartic acid and glutamic acid was not affected by the procedure.
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Nozaki et al. (1988) studied this question.
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