A fast and simple one-pot synthesis of carbamoylazides of α-N-protected amino acids is reported. The procedure involves the reaction between sodium azide and the mixed anhydride obtained from an α-N-protected amino acid and isobutyl chloroformate, in the presence of KH 2 PO 4 . The reaction rate was influenced by the nature of both the α-N-protection and the amino acid side chain. Surprisingly, T
报道了一种快速简单的一锅法合成 α-N-保护氨基酸的氨基甲酰叠氮化物。该过程涉及叠氮化钠与由α-N-保护的氨基酸和氯甲酸异丁酯获得的混合酸酐在KH 2 PO 4 存在下的反应。反应速率受α-N-保护和氨基酸侧链的性质影响。令人惊讶的是,叔丁氧羰基 (α-N-Boc) 和苄基氧羰基 (α-N-Cbz) 保护的脯氨酸提供了相应的异氰酸酯,而不是预期的氨基甲酰基叠氮化物。
Simple and Mild One-Pot Synthesis of Dipeptidyl Ureas via Carbamoyl Azides of <font>α</font>-<i>N</i>-Protected Amino Acids
[image omitted] A simple and mild one-pot synthesis of potentially bioactive -N-protected dipeptidyl ureas is reported. The procedure involves the reaction between the carbamoyl azide of an -N-protected amino acid and an -amino acid methyl ester. The reaction is fast (3h at 45 degrees C), regardless of the nature of both the reagents, and racemization free. The reported protocol represents a valid alternative to existing methods.
Study of the Reaction between Carbamoyl Azides of α-N-Protected Amino Acids and Hydrazine Monohydrate
synthetic methods for the preparation of semicarbazide amino acid derivatives are reported. The procedures involve reactionbetween the carbamoyl azides of α-N-protected amino acids and hydrazine monohydrate: 4-[(alkoxycarbonylamino)(alkyl)methyl]semicarbazides 1 are obtained when hydrazine is added to the separated tetrahydrofuran (THF) solution containing the carbamoyl azide at 0 °C, whereas 1-[(al