Bifunctional acid–base ionic liquid for the one-pot synthesis of fine chemicals: Thioethers, 2H-chromenes and 2H-quinoline derivatives
作者:Maria J. Climent、Sara Iborra、Maria J. Sabater、Juan D. Vidal
DOI:10.1016/j.apcata.2014.05.004
日期:2014.7
A bifunctionalorganocatalyst with ionicliquid properties and with an optimized distancebetween the acid and basic sites efficiently activates electron deficient olefins for 1,4 conjugated addition, which can be incorporated in different one-pot transformations for the preparation of cyclic and acyclic compounds of biological and synthetic interest. More specifically, the catalyst can be successfully
Diastereoselective synthesis of benzo[d]chromeno[3′,4′:3,4]pyrrolo[2,1-b]thiazoles via cycloaddition reaction of benzothiazolium salts with 3-nitrochromenes
作者:Wang Jiang、Jing Sun、Chao-Guo Yan
DOI:10.1039/c7ra06548e
日期:——
were also easily obtained by sequential oxidation with DDQ. The stereochemistry of the polycyclic compounds was clearly elucidated by analysis of NMR spectroscopy results and determination of single crystal X-ray structures. The reaction is believed to proceed via endo-[3 + 2] cycloaddition of the in situ generated anti-form ylides to the cyclic dipolarophiles.
室温下,在乙醇中,由三乙胺介导的溴化2-苯甲酰基-或2-烷氧基羰基甲基苯并噻唑鎓与3-硝基苯并茂的1,3-偶极环加成反应得到官能化的四氢苯并[ d ]色酚[3',4':3,4]吡咯并[2] ,1- b ]噻唑的产率为83–95%,非对映选择性高。相应的脱氢苯并[ d ]铬基[3',4':3,4]吡咯并[2,1- b ]噻唑也可以通过用DDQ顺序氧化而容易地获得。通过分析NMR光谱结果和确定单晶X射线结构,可以清楚地阐明多环化合物的立体化学。据信该反应是通过内-[3 + 2]环加成而进行的。原位产生的环状双极性亲抗剂。
Microwave‐assisted rapid and efficient synthesis of chromene‐fused pyrrole derivatives through multicomponent reaction and evaluation of antibacterial activity with molecular docking investigation
current study aimed to identify a new strategy of FeCl3 catalyzed multicomponent synthesis of substituted2H‐chromene–fused pyrrole derivatives. A series of chromene‐based pyrrole prepared by employing an array of 3‐nitro‐2H‐chromenes, aniline, and acetylacetone in toluene under microwave irradiation. Using FeCl3 as a prompt catalyst and microwave irradiation to synthesize 2H‐chromene–fused pyrrole motifs
Selective construction of functionalized chromeno[3,4-<i>b</i>]pyrroles and benzo[<i>c</i>]chromenes<i>via</i>a K<sub>3</sub>PO<sub>4</sub>promoted three-component reaction
作者:Wang Jiang、Jing Sun、Chao-Guo Yan
DOI:10.1039/c9nj05693a
日期:——
A K3PO4promoted three-component reaction of pivaloylacetonitrile (benzoylacetonitrile), dialkyl but-2-ynedioates and 2-aryl-3-nitrochromenes afforded functionalized chromeno[3,4-b]pyrroles.
3-Nitrochromenes are readily converted into 4-phosphorylchromenes on treatment with dialkylphosphite in the presence of triethylamine in 60–70% yield. This method provides a general method for the preparation of alkenyl phosphonates from nitroalkenes and dialkylphosphite.