3-allenoic acids with AgSCF3 in the presence of (NH4)2S2O8 and catalytic copper salt was investigated. A series of 4-aryl-2,3-allenoic acids underwent radical trifluoromethylthiolation/intramolecular cyclization to afford β-trifluoromethylthiolated butenolides, which were conveniently transformed into trifluoromethylthiolated furan derivatives. In contrast, 2-monosubstituted 2,3-allenoic acids were converted
研究了在(NH 4)2 S 2 O 8和催化铜盐存在下,AgSCF 3对2,3-烯丙基酸的氧化三氟甲基硫醇化反应。一系列的4-芳基-2,3-烯丙酸经过自由基三氟甲基硫醇化/分子内环化反应,得到β-三氟甲基硫醇化的丁烯化物,将其方便地转化为三氟甲基硫醇化的呋喃衍生物。相反,在相似的反应条件下,将2-单取代的2,3-烯丙酸转化成相应的3,4-双(三氟甲硫基)丁-2-烯酸。
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
An iron-catalyzed three-component cyanoalkylsulfonylation of 2,3-allenoic acids, K2S2O5, and the ring-opening of cyclobutanone oximeesters is described. The radical tandem cyclization route allows access to diverse cyanoalkylsulfonylated butenolides in moderate to good yields under mild conditions. Moreover, the products are further converted, offering the corresponding derivatives.
描述了铁催化的 2,3-丙二烯酸、K 2 S 2 O 5 的三组分氰基烷基磺酰化和环丁酮肟酯的开环。自由基串联环化路线允许在温和条件下以中等至良好的产率获得各种氰基烷基磺酰化丁烯内酯。此外,产品进一步转换,提供相应的衍生产品。
Copper-Catalyzed Phosphorylation of 2,3-Allenoic Acids and Phosphine Oxide: Access to Phosphorylated Butenolides
Cu-catalyzed annulation of 2,3-allenoic acids with diphenylphosphine oxide, leading to the formation of 4-phosphate butenolides in up to 88% yield. The formation of the C–Pbond provides new avenues for the functionalization of different furan-2(5H)-ones, with favorable features such as suitable functional group tolerance and mild synthesis conditions.
我们研究了一种新型的 Cu 催化的 2,3-烯丙酸与二苯基氧化膦的环化,导致以高达 88% 的产率形成 4-磷酸丁烯内酯。C-P键的形成为不同呋喃-2( 5H )-酮的功能化提供了新的途径,具有合适的官能团耐受性和温和的合成条件等有利特征。
Hypolipidemic allene carboxylic acids
申请人:Sandoz, Inc.
公开号:US04011339A1
公开(公告)日:1977-03-08
The compounds are 4-aryl substituted buta-2,3-dienoic acids and esters thereof which may also be lower alkyl-substituted at any of the 2- and 4-positions, e.g., 4-(p-methoxyphenyl)-2-methyl-buta-2,3-dienoic acid. The compounds are useful as pharmaceuticals, e.g., as anti-inflammatory agents and hypolipidemic agents.