Base-induced transformations of ortho-nitrobenzylketones: intramolecular displacement of nitro group versus nitro-nitrite rearrangement
作者:Sergey I. Filimonov、Zhanna V. Chirkova、Igor G. Abramov、Sergey I. Firgang、Galina A. Stashina、Yuri A. Strelenko、Dmitriy V. Khakimov、Tatyana S. Pivina、Alexander V. Samet、Kyrill Yu. Suponitsky
DOI:10.1016/j.tet.2012.05.034
日期:2012.7
4-(2-R-2-oxoethyl)-5-nitrophthalonitriles either undergo nitro-nitrite rearrangement resulting in 3-acyl-1,2-benzoxazole-5,6-dicarbonitriles or yield 2-R-benzofuran-5,6-dicarbonitriles with a nitrogroupdisplacement.
4-溴-5-硝基邻苯二甲腈(BNPN)与4- R -2,4-二氧代丁酸烷基酯的烯醇盐的反应生成了3-酰基-5,6-二氰基苯并呋喃-2-羧酸烷基酯,4-(2- R -2-氧乙基)-5-硝基邻苯二甲腈或3-酰基-1,2-苯并恶唑-5,6-二甲腈。用碱使4-(2- R -2-氧代乙基)-5-硝基邻苯二甲腈进行亚硝酸盐重排,生成3-酰基-1,2-苯并恶唑-5,6-二腈或生成2- R-苯并呋喃-具有硝基取代基的5,6-二腈。
Formation of 4-(het)aryl-3H-1,5-benzodiazepine-2-carboxylates from (het)aroylpyruvate esters and o-phenylenediamine
作者:Ekaterina E. Khramtsova、Maksim V. Dmitriev、Andrey N. Maslivets
DOI:10.1007/s10593-023-03235-6
日期:2023.8
Esters of (het)aroylpyruvic acids can react with o-phenylenediamine, leading to the formation of (Z)-3-(2-(het)aryl-2-oxoethylidene)-3,4-dihydroquinoxalin-2(1H)-ones and 4-(het)aryl-3H-1,5-benzodiazepine-2-carboxylates. The obtained product ratio depends on the electronic effects due to substituents in the (het)aroyl moiety of (het)aroylpyruvate esters and the reaction conditions. The highest ratio
(杂)芳酰基丙酮酸的酯可以与邻苯二胺反应,导致形成 ( Z )-3-(2-(杂)芳基-2-氧代亚乙基)-3,4-二氢喹喔啉-2(1 H )-和4-(杂)芳基-3H- 1,5-苯二氮卓-2-羧酸酯。所获得的产物比率取决于由于(杂)芳酰基丙酮酸酯的(杂)芳酰基部分中的取代基所产生的电子效应和反应条件。当使用不带取代基的(杂)芳酰基丙酮酸酯时,以及在乙酸中进行反应时,观察到与药物化学相关的喹喔啉酮的最高比例,取代基会导致(杂)芳酰基部分产生负面介观效应。