Gold‐Catalyzed Annulations of
<i>N</i>
‐Propargyl Ynamides with Anthranils with Two Distinct Chemoselectivities
作者:Yu‐Chen Hsu、Shu‐An Hsieh、Rai‐Shung Liu
DOI:10.1002/chem.201806083
日期:2019.4.5
Gold‐catalyzed annulation of N‐propargyl ynamides with anthranils can proceed by two distinct mechanisms. In the case of a terminal N‐propargyl ynamide, its resulting α‐imino gold carbene reacts with a tethered alkyne to generate a vinyl cation to enable hydrolysis, which ultimately yields a pyrrolo[2,3‐b]quinoline derivative after treatment with p‐toluenesulfonic acid. For an internal alkyne, its
金催化的N-炔丙基乙酰胺与蒽的环化反应可以通过两种不同的机理进行。在末端N-炔丙基炔基酰胺的情况下,其生成的α-亚氨基金卡宾与链状炔反应生成乙烯基阳离子以实现水解,经p处理后最终生成吡咯并[2,3- b ]喹啉衍生物甲苯磺酸。对于内部炔烃,其α-亚氨基金卡宾通过乙烯基阳离子或烯基金卡宾与链状炔反应。两种途径最终都会导致生成4-酮-2-氨基吡咯衍生物。我们的机理分析表明,对于末端乙酰胺,水是比蒽乙更好的亲核试剂,而水和蒽甲对内部乙酰胺具有同等的反应性。