A new way of forming the aza-o-xylylene with easily accessible 1,2-dihydroquinolines as precursor has been developed. The presence of an electron-donating group at the proper position of 1,2-dihydroquinoline was crucial for protonation of the alkene through dearomatization with a simple Brønsted acid. The in situ forming reactive intermediate was trapped with Hantzsch ester to afford tetrahydroquinolines
已开发出一种以容易获得的1,2-二氢
喹啉为前体形成氮杂
邻二甲苯的新方法。在1,2-二氢
喹啉的适当位置上存在一个供电子基团,这对于通过简单的布朗斯台德酸进行脱芳构作用使烯烃的质子化至关重要。用Hantzsch酯捕获原位形成的反应性中间体,从而以优异的收率和对映选择性提供
四氢喹啉。