Abstract
Amino acid N-carboxyanhydrides (NCAs) are conventionally synthesized from α-amino acids and phosgene. The present study reports in situ photo-on-demand phosgenation reactions of amino acids with CHCl3 for synthesizing NCAs. A series of NCAs were obtained on a gram scale upon photo-irradiation of a mixture solution of CHCl3 and CH3CN containing an amino acid at 60-70 °C under O2 bubbling. This method presents a safe and convenient reaction controlled by light without special apparatuses and reagents.
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