Cyclic Oxalylation of Primary N-Substituted Anthranilamides: 1H-Benzo[e][1,4]diazepine-2,3,5(4H)-triones and 11a-Chlorobenzo[ e]oxazolo[3,2-a][1,4]diazepine-2,3,5,11(10H,11aH)-tetraones
Cyclic Oxalylation of Primary N-Substituted Anthranilamides: 1H-Benzo[e][1,4]diazepine-2,3,5(4H)-triones and 11a-Chlorobenzo[ e]oxazolo[3,2-a][1,4]diazepine-2,3,5,11(10H,11aH)-tetraones
Bis(2-methoxyethyl)ether promoted intramolecular acceptorless dehydrogenative coupling to construct structurally diverse quinazolinones by molecular oxygen
A simple, efficient, and clean approach for the synthesis of diverse dihydroisoquinolino[2,1-a]quinazolinones, 2-aryl quinazolinones, and analogues through intramolecular acceptorless dehydrogenative coupling has been achieved. The combination of bis(2-methoxyethyl)ether and molecular oxygen was identified as a highly efficient system for this oxidative dehydrogenative coupling sequential transformation
已经实现了一种通过分子内无受体脱氢偶联合成多种二氢异喹啉[ 2,1- a ]喹唑啉酮、2-芳基喹唑啉酮和类似物的简单、高效和清洁的方法。双(2-甲氧基乙基)醚和分子氧的组合被确定为这种氧化脱氢偶联顺序转化的高效体系,无需外部引发剂、催化剂和添加剂。通过29个例子的范围和克级反应证明了其适用性和实用性。还进行了一些对照实验以支持可能的反应途径。
AbstractA novel approach for the synthesis of 2‐arylquinazolin‐4(3H)‐ones was developed. A series of title compounds were obtained with good functional group tolerance and good yields by I2/DMSO‐mediated intramolecular oxidative cross‐coupling of 2‐(benzylamino)benzamides to form C=N double bonds. This method was applicable for gram‐scale synthesis. A proposed reaction pathway based on some control experiments was also provided.