New synthesis of methyl 5-aryl or heteroaryl pyrrole-2-carboxylates by a tandem Sonogashira coupling/5-endo-dig-cyclization from β-iododehydroamino acid methyl esters and terminal alkynes |
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收稿时间: | 28 July 2008 |
修稿时间: | 28 August 2008 |
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