Copper-Catalyzed Synthesis of Trisubstituted Isoxazoles via a Cascade Cyclization–Migration Process
作者:Masafumi Ueda、Shoichi Sugita、Aoi Sato、Tetsuya Miyoshi、Okiko Miyata
DOI:10.1021/jo301358h
日期:2012.10.19
An atom-economical, catalytic, and regioselective synthesis of 3,4,5-trisubstituted isoxazoles has been successfully developed. Treatment of O-arylmethyl alkynyl oxime ethers with 5 mol % of Cu(OTf)2 in chlorobenzene at reflux gave 4-arylmethylisoxazoles in good to excellent yields via the sequential intramolecular addition of the oxime moiety to the alkyne with subsequent 1,3-migration of the arylmethyl
已经成功地开发了3,4,5-三取代的异恶唑的原子经济,催化和区域选择性合成。在回流下用5 mol%的Cu(OTf)2在氯苯中的O-芳基甲基炔基肟醚处理,通过依次将肟部分分子内添加到炔烃中并随后进行1,3迁移,以良好的收率获得了优良的4-芳基甲基异恶唑。芳基甲基的基团。