Efficient activity of magnesium–aluminium hydrotalcite in the synthesis of amides
作者:José Antonio Morales-Serna、Miguel Ángel Jaime-Vasconcelos、Eréndira García-Ríos、Alejandro Cruz、Deyanira Angeles-Beltrán、Leticia Lomas-Romero、Guillermo Enrique Negrón-Silva、Jorge Cárdenas
DOI:10.1039/c3ra42335b
日期:——
The synthesis of amides by coupling benzotriazole esters and amines can be achieved conveniently in moderate to excellent yields (50â95%) using a commercial, synthesized, calcined or reconstructed MgâAl hydrotalcite instead of one of the classic bases (tertiary amines). The experimental results demonstrated that commercial and synthesized hydrotalcite can be quantitatively recovered from the reaction by simple filtration and reused for a number of cycles and that the reconstructed hydrotalcite is the most active form for the amide bond formation. Finally, to test the scope of the protocol for the synthesis of biologically relevant molecules, the total synthesis of Sansalvamide A was carried out.
使用商用的、合成的、煅烧的或重构的 MgâAl 氢滑石代替一种传统碱(叔胺),可以方便地通过苯并三唑酯和胺的偶联合成酰胺,收率从中等到极好(50%â95%)不等。实验结果表明,商用和合成的氢铝土可通过简单过滤从反应中定量回收,并可重复使用多次,而且重构氢铝土是形成酰胺键的最活跃形式。最后,为了测试该方案在合成生物相关分子方面的应用范围,我们进行了 Sansalvamide A 的全合成。