Asymmetric phase-transfer mediated epoxidation of α,β-unsaturated ketones using catalysts derived from Cinchona alkaloids
作者:Barry Lygo、Philip G. Wainwright
DOI:10.1016/s0040-4039(97)10779-1
日期:1998.3
The enantioselective epoxidation of α,β-unsaturated ketones utilising Cinchona alkaloid-derived quaternary ammonium phase-transfer catalysts bearing an N-anthracenylmethyl function are presented. It has been found that the O-benzyl derivatives of these catalysts in conjunction with sodium hypochlorite give high stereocontrol and application of this process to the enantioselective synthesis of a range
Tandem reaction between chalcone epoxides and 2-naphthyl ethers to construct complex naphtho[2,1-b]furans
作者:Congde Huo、Jinzhu An、Xiaolan Xu、Xiaodong Jia、Xicun Wang、Lisheng Kang
DOI:10.1016/j.tetlet.2012.12.078
日期:2013.2
The reaction of chalcone epoxides with 2-naphthyl ethers can be initiated by stable triarylaminium salt. And after subsequent aerobic oxidative aromatization in one pot, a series of polysubstituted naphtho[2,1-b]furans were delivered.
查尔酮环氧化物与2-萘醚的反应可以通过稳定的三芳基ami盐引发。然后在一个锅中进行好氧氧化芳构化后,输送了一系列多取代的萘并[2,1- b ]呋喃。
Friedel–Crafts alkylation between chalcone epoxides and heteroarenes induced by triarylaminium salt
作者:Congde Huo、Xiaolan Xu、Xiaodong Jia、Xicun Wang、Jinzhu An、Chougu Sun
DOI:10.1016/j.tet.2011.10.062
日期:2012.1
Triarylaminiumsalt was disclosed as a highly efficient nonmetallic initiator for the Friedel–Crafts reaction between chalcone epoxides and heteroarenes to construct a series of complex β-heteroaryl α-ketols in mild conditions and with good yields. Chalcone epoxides were presented as valuable halogen-free pre-electrophile in Friedel–Crafts alkylation through the formation of the stabilized benzylic
Approach to Construct Polysubstituted 1,2-Dihydronaphtho[2,1-<i>b</i>]furans and Their Aerobic Oxidative Aromatization
作者:Congde Huo、Xiaolan Xu、Jinzhu An、Xiaodong Jia、Xicun Wang、Cheng Wang
DOI:10.1021/jo300827s
日期:2012.9.21
2-naphthols to construct polysubstituted 1,2-dihydronaphtho[2,1-b]furans. The DDQ/NaNO2/O2 catalytic system was first applied to the aerobic oxidative aromatization of heterocycles, and a simple and efficient one-pot tandem FC alkylation/annulation/aerobic oxidative aromatization procedure was also developed for the synthesis of complex naphtho[2,1-b]furans.
公开了三芳基ami盐作为查尔酮环氧化物和2-萘酚之间新型Friedel-Crafts烷基化/环状级联反应以构建多取代的1,2-二氢萘并[2,1- b ]呋喃的有效引发剂。DDQ / NaNO 2 / O 2催化系统首先用于杂环的好氧氧化芳构化,还开发了一种简单高效的一锅串联FC烷基化/环化/好氧氧化芳构化方法来合成复杂的萘[2]。 ,1- b ]呋喃。
Cascade annulation reaction (CAR): highly diastereoselective synthesis of pyranopyrazole scaffolds
作者:Manickam Bakthadoss、Manickam Surendar
DOI:10.1039/d0ra03400b
日期:——
An unprecedented domino protocol for the novel synthesis of highly diverse and functionalized tetrahydro pyranopyrazole scaffolds using chalcone epoxide has been reported for the first time. This synthetic protocol generates three consecutive stereogenic centres in a highlydiastereoselective manner with the formation of vicinal diol and a quaternary carbon centre. A wide range of substrates were utilized