Microwave-Assisted Formylations of Weakly Basic Anilines with Methyl Formate Catalyzed by Calcium and Hydrogen Triflimides
作者:Eric Tan、Sosthène Ung、Matthieu Corbet
DOI:10.1002/ejoc.201600226
日期:2016.4
hydrogen triflimides [Ca(NTf2)2, HNTf2] were found to be efficient for the solvent-free formylation of a variety of weakly basic anilines by using cheap and widely available methyl formate as the formylating agent under microwave irradiation. Initial investigations showed that in the case of calcium triflimide, Bronsted acid catalysis was most likely operating. Remarkably, the corresponding calcium triflate
发现催化量的三氟甲磺酸钙和氢 [Ca(NTf2)2, HNTf2] 通过使用廉价且广泛可用的甲酸甲酯作为微波辐射下的甲酰化剂,可有效地对各种弱碱性苯胺进行无溶剂甲酰化。初步调查表明,在三氟甲磺酸钙的情况下,布朗斯台德酸催化最有可能起作用。值得注意的是,相应的三氟甲磺酸钙和三氟甲磺酸钙的活性明显较低。