Assembly of indole-2-carboxylic acid esters through a ligand-free copper-catalysed cascade process
2009
Cai, Qian | Li, Zhengqiu | Wei, Jiajia | Ha, Chengyong | Pei, Duanqing | Ding, Ke
A straightforward synthesis of indole-2-carboxylic esters was developed through a ligand-free copper-catalysed condensation/coupling/deformylation cascade process from 2-halo aryl aldehydes or ketones with ethyl isocyanoacetate. The reactions proceeded well for most of the 2-iodo-, bromo-, and chloro-subtrates under room temperature or mild conditions.
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