N-Heterocyclic Carbene Catalyzed Intramolecular Hydroacylation of Activated Alkynes: Synthesis of Chromones
作者:Seenuvasan Vedachalam、Qian-Ling Wong、Biswajit Maji、Jing Zeng、Jimei Ma、Xue-Wei Liu
DOI:10.1002/adsc.201000828
日期:2011.2.11
An organocatalytic intramolecular Stetter-type hydroacylation reaction between an aldehyde and an activated alkyne has been developed. This study induces salicylaldehyde-derived alkyne derivatives to assemble into a series of chromone derivatives using a catalytic amount of thiazolium-based carbene catalyst.
Gold(<scp>iii</scp>)-catalyzed synthesis of aroylbenzo[b]oxepin-3-ones from ortho-O-propargyl-1-one substituted arylaldehydes
作者:N. S. V. M. Rao Mangina、Surisetti Suresh、Balasubramanian Sridhar、Galla V. Karunakar
DOI:10.1039/c5ob02676h
日期:——
An efficient gold-catalyzed intramolecular cyclization of ortho-O-propargyl-1-one substituted arylaldehydes has been achieved for the generation of substituted aroylbenzo[b]oxepin-3-one derivatives in moderate to good yields. This synthetic transformation proceeds via gold-catalysed oxidation of the internal alkyne moiety followed by an intramolecular condensation leading to seven-membered oxacycles
已经实现了邻-O-炔丙基-1-酮取代的芳醛的高效金催化的分子内环化,以中等至良好的产率生成了取代的芳酰基苯并[ b ]氧杂环丁-3-酮衍生物。这种合成的转化过程是通过内部炔烃部分的金催化氧化,随后的分子内缩合产生七元氧杂环而进行的。