Copper(II)-Catalyzed Reaction of 2,3-Allenoic Acids, Sulfur Dioxide, and Aryldiazonium Tetrafluoroborates: Route to 4-Sulfonylated Furan-2(5<i>H</i>)-ones
作者:Kaida Zhou、Jun Zhang、Guanyinsheng Qiu、Jie Wu
DOI:10.1021/acs.orglett.8b03718
日期:2019.1.4
A copper(II)-catalyzed three-component reaction of 2,3-allenoic acids, sulfur dioxide, and aryldiazonium tetrafluoroborates under mild conditions is developed, leading to 4-sulfonylated furan-2(5H)-ones in good yields. Not only sodium metabisulfite but also 1,4-diazabicyclo[2.2.2]octane-sulfur dioxide (DABCO·(SO2)2) is workable under the conditions. This transformation proceeds through a radical process
在温和的条件下开发了铜(II)催化的2,3-烯丙基酸,二氧化硫和芳基重氮四氟硼酸酯的三组分反应,从而以良好的收率得到了4-磺酰化的呋喃-2(5 H)-一。在该条件下,不仅焦亚硫酸钠而且1,4-二氮杂双环[2.2.2]辛烷-二氧化硫(DABCO·(SO 2)2)都是可行的。该转变通过自由基过程进行,该自由基过程是通过将芳基磺酰基基团加到2,3-烯丙酸的C中心位置开始的。证明了广泛的底物范围,并且容许许多敏感的官能团。