Microwave-Assisted Cerium(III)-Promoted Cyclization of Propargyl Amides to Polysubstituted Oxazole Derivatives
作者:Giuseppe Bartoli、Cristina Cimarelli、Roberto Cipolletti、Simone Diomedi、Riccardo Giovannini、Margherita Mari、Laura Marsili、Enrico Marcantoni
DOI:10.1002/ejoc.201101302
日期:2012.1
we report that, under microwave irradiation, the CeCl3·7H2O/NaI/I2 system is capable of promoting a 5-exo-dig cyclization of propargyl amides with good functional group tolerance. The microwave reactor also provides a more convenient and safer method for heating the reaction. This methodology represents a straightforward CeCl3·7H2O/NaI/I2 promoted cyclization using microwave irradiation to accomplish
功能化多取代恶唑是一类重要的五元 N,O-杂环,广泛存在于天然产物和精细化学品的结构中。它们还经常用作合成具有更复杂结构的杂环分子的构件。因此,需要基于路易斯酸促进反应的有效合成方案。在此背景下,我们报告说,在微波辐射下,CeCl3·7H2O/NaI/I2 系统能够促进具有良好官能团耐受性的炔丙酰胺的 5-exo-dig 环化。微波反应器还提供了一种更方便、更安全的反应加热方法。该方法代表了一种简单的 CeCl3·7H2O/NaI/I2 促进环化反应,使用微波辐射完成多取代恶唑衍生物的合成。