Silver-Catalyzed Radical Cascade Cyclization toward 1,5-/1,3-Dicarbonyl Heterocycles: An Atom-/Step-Economical Strategy Leading to Chromenopyridines and Isoxazole-/Pyrazole-Containing Chroman-4-Ones
作者:Hao Hu、Xiaolan Chen、Kai Sun、Junchao Wang、Yan Liu、Hui Liu、Lulu Fan、Bing Yu、Yuanqiang Sun、Lingbo Qu、Yufen Zhao
DOI:10.1021/acs.orglett.8b02627
日期:2018.10.5
A novel and convenient silver-catalyzed radical cascade cyclization toward a large variety of 1,5-/1,3-dicarbonyl heterocycles containing a chroman-4-one, indanone, or 2,3-dihydroquinolin-4(1H)-one moiety was developed, by reacting various 2-functionalized benzaldehydes, including 2-allyloxy benzaldehydes, 2-allyl benzaldehyde, and 2-N(Ts)CH2–CH═CH2 substituted benzaldehyde, with 1,3-dicarbonyl compounds
一种新颖且方便的银催化自由基级联环化反应,形成多种多样的含苯并二氢吡喃-4-酮,茚满酮或2,3-二氢喹啉-4(1 H)-的1,5- / 1,3-二羰基杂环部分被开发,通过各种2官能苯甲醛,包括2-烯丙氧基苯甲醛,2-烯丙基苯甲醛,和2-N(Ts)的CH反应2 -CH = CH 2取代的苯甲醛,在存在1,3-二羰基化合物AgNO 3 / K 2 S 2 O 8的在温和的反应条件下放入一锅中。新获得的含1,5- / 1,3-二羰基的杂环进一步直接用于合成结构上更多样化的多杂环,主要包括色吡啶和含异恶唑或吡唑的苯并二氢吡喃-4-酮。