Brønsted Acid-Promoted Sequential Hydroarylation- Hydroamidation of Arene-Tethered 1-(2-Alkynylphenyl)ureas: Direct Access to 4,4-Spiro-3,4-dihydro-2-(1H)-quinazolinones
作者:Honggen Wang、Jiaji Zhao、Jiancun Zhang、Qiang Zhu
DOI:10.1002/adsc.201100223
日期:2011.10
A Brønsted acid-promoted approach to 4,4-sipro-3,4-dihydro-2-(1H)-quinazolinones from arene-tethered 1-(2-alkynylphenyl)ureas has been developed. The reaction is initiated by intramolecular hydroarylation followed by hydroamidation, assisted by intramolecular proton transfer from the protonated urea moiety. A variety of tethering atoms, including carbon, oxygen, sulfur, and protected nitrogen are compatible
已经开发了一种由布朗斯台德酸促进的方法,用于从芳烃系的1-(2-炔基苯基)脲中合成4,4-sipro-3,4-二氢-2-(1 H)-喹唑啉酮。反应通过分子内加氢芳基化,然后进行加氢酰胺化,并由质子化尿素部分进行分子内质子转移而引发。各种束缚原子,包括碳,氧,硫和受保护的氮,都与反应条件兼容。