Highly Efficient Four-Component Synthesis of 4(3<i>H</i>)-Quinazolinones: Palladium-Catalyzed Carbonylative Coupling Reactions
作者:Lin He、Haoquan Li、Helfried Neumann、Matthias Beller、Xiao-Feng Wu
DOI:10.1002/anie.201308756
日期:2014.1.27
Given the importance of quinazolinones and carbonylative transformations, a palladium‐catalyzed four‐component carbonylative coupling system for the synthesis of diverse 4(3H)‐quinazolinone in a concise and convergent fashion has been developed. Starting from 2‐bromoanilines (1 mmol), trimethyl orthoformate (2 mmol), and amines (1.1 mmol), under 10 bar of CO, the desired products were isolated in good
考虑到喹唑啉酮和羰基化转化的重要性,已经开发了一种钯催化的四组分羰基化偶联体系,用于以简明和收敛的方式合成各种4(3 H)-喹唑啉酮。在10 bar CO下,从2-溴苯胺(1 mmol),原甲酸三甲酯(2 mmol)和胺(1.1 mmol)开始,在Pd(OAc)2(2 mol %),BuPAd 2(6 mol%)在1,4-二恶烷(2 mL)中在100°C下使用N,N-二异丙基乙胺(2 mmol)为碱。值得注意的是,该方法可耐受各种反应性官能团的存在,并且对喹唑啉酮类具有非常高的选择性,并且被用于生物活性二氢芸香碱的前体的合成。