本论文以 L-脯氨酸、L-苯丙氨酸、 L-苯甘氨酸、 L-酪氨酸等为原料,经缩合、加氢脱保护基、环化等步骤合成了三种手性环二肽:环(L-苯丙-L-脯)二肽、环(L-苯甘-L-脯)二肽、 环(L-酪-L-脯)二肽。通过质谱 和 HNMR、CNMR表征了这些环二肽及中间体的结构。
实验表明,采用N端酰基化和C端甲酯化保护法,再用DCC缩合得二肽酯化物,经Pd/C催化脱酰基、酯基,最后得到环二肽产物,此合成方法副反应少,转化率高,操作简便等优点。5554
关键词 L-脯氨酸 环二肽合成 DCC缩合 钯/碳氢解
Title The synthsis of DKPs bearing proline residues
Abstract
L-proline, L-phenylalanine, L-phenylglycine, L-tyrosine as start materials, three diketopiperazines (cyclodipeptides) bearing L-porline residue were synthesized by condensation, hydrogenation de-protecting groups, cyclization, that is cyclo(L-Phe-L-Pro) , cyclo(L-Phg-L-Pro) and cyclo(L-Tyr-L-Pro). By mass spectrometry and 1HNMR, 13CNMR measurements, the structure of these cyclodipeptides and intermediates were confirmed.
The experiment shows that the N-terminal acylation and C-terminal methyl protection,and then DCC condensation of the dipeptide ester, catalyzed by Pd / C off acyl, ester, and finally the product of cyclic peptides, this synthesis method showed lower side reaction, higher conversion rate, and easy operation.
Keywords L-proline residue synthesis cyclodipeptides DCC condensation Pd/C catalyst
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