the synthesis of quinazolinones, quinoxalinones, benzooxazinones, and benzothiazoles from the reactions of α-keto acids with 2-aminobenzamides, benzene-1,2-diamines, 2-aminophenols, and 2-aminobenzenethiols, respectively, is described. The reactions were conducted under catalyst-free conditions, using water as the sole solvent with no additive required, and successfully applied to the synthesis of sildenafil
Two facile and effective C-3 arylation protocols of quinoxalin-2(1H)-ones with arylhydrazines and aryl boronic acids respectively via free radical cross-coupling reactions under metal-, photocatalyst- and light-free conditions have been unveiled. K2S2O8 has been used as an efficient oxidant to generate aryl radicals from arylhydrazines and aryl boronic acids under two different reaction conditions
已经揭示了喹喔啉-2( 1H )-酮分别与芳基肼和芳基硼酸通过自由基交叉偶联反应在金属、光催化剂和无光条件下进行的两种简便有效的C-3芳基化方案。 K 2 S 2 O 8已被用作有效的氧化剂,在两种不同的反应条件下由芳基肼和芳基硼酸生成芳基自由基。生成的芳基自由基在喹喔啉-2(1 H )-酮的C-3位发生自由基偶联反应,以良好至优异的产率产生3-芳基喹喔啉-2(1 H )-酮。 2,2,6,6-四甲基哌啶-1-氧基自由基捕获实验已证明自由基参与反应过程。