An Efficient Synthesis of Functionalized 6,10-Dioxo-6,10-dihydro-5H-pyrido[1,2-a]quinoxalines and 6,10-Dioxo-6,10-dihydropyrido[2,1-c][1,4]benzoxazines
1,4-Benzoxazines have been explored as versatile precursors for the synthesis of novel benzoxazine and benzoxazinone derivatives. 2-Hydroxy-1,4-benzoxazines and 1,4-benzoxazinones have been functionalized with thiols and N-arylmaleimides, respectively, in the presence of BF3·OEt2 as a promoter. All the products were obtained in moderate to excellent yields. The Michael reactions of the benzoxazinones
FeCl<sub>3</sub>-Mediated Domino Reaction of Benzoxazinones with Aroylmethylidene Malonates: Synthesis to Functionalized Pyrrolobenzoxazines
作者:Shweta Bisht、Rama Krishna Peddinti
DOI:10.1021/acs.joc.7b02207
日期:2017.12.15
efficient domino approach for the synthesis of pyrrolobenzoxazine derivatives is described. The FeCl3-promoted domino reaction between aroylmethylidene malonates and benzoxazinones has been successfully established to afford the title compounds in good to excellent yield under mild reaction conditions. The domino protocol provides a concise and straightforward access to highly substituted pyrrolobenzoxazines
Zn(OTf)2-Catalyzed 1,6-Conjugate Addition of Benzoxazinones to p-Quinone Methides: Access to 3,3-Diaryl-2-(2-oxo-2H-1,4-benzoxazin-3-yl)propanoic Acid Esters
作者:Rama Krishna Peddinti、Neha Dua、Sonali Ghosh
DOI:10.1055/s-0040-1706600
日期:2021.3
An effective method for the synthesis of 3,3-diaryl-2-(2-oxo-2H-1,4-benzoxazin-3-yl)propanoic acidesters is reported. A novel zinc triflate-catalyzed regioselective 1,6-conjugate addition of vinylogous carbamates to p-quinone methides for accessing the title compounds has been developed. This protocol furnished the hybrid compounds in good to excellent yields. The reaction is rapid and has a broad
报道了一种合成3,3-二芳基-2-(2-氧代-2 H -1,4-苯并恶嗪-3-基)丙酸酯的有效方法。已经开发了一种新的三氟甲磺酸锌催化的乙烯基氨基甲酸酯向对苯醌甲基化物的区域选择性的1,6-共轭加成,以得到标题化合物。该方案为杂种化合物提供了良好的优良收率。该反应是快速的并且具有广泛的底物范围。