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
Iodine-Catalyzed Regioselective Synthesis of Multisubstiuted Pyrrole Polyheterocycles Free from Rotamers and Keto–Enol Tautomers
作者:Nitika Sharma、Rama Krishna Peddinti
DOI:10.1021/acs.joc.7b01538
日期:2017.9.15
A highly regioselective iodine-mediated cascade reaction for the synthesis of multifunctional polyheterocyclic systems is developed by employing 3-(2-oxo-2-arylethylidene)oxindoles and 1,4-benzoxazinone as starting materials. The polyheterocycles are skillfully embraced with oxindole, pyrrole, and coumarin scaffolds, which are well-known for their enriched biological activity. The current approach