Variations in the Blaise Reaction: Conceptually New Synthesis of 3-Amino Enones and 1,3-Diketones
作者:H. Surya Prakash Rao、Nandurka Muthanna
DOI:10.1002/ejoc.201403402
日期:2015.3
2-bromoethanones. The reaction is a variation of the classical Blaisereaction, and it works with zinc and trimethylsilyl chloride as an activator. By running the hydrolysis of the reaction intermediate with HCl (3 n aq.) at 0–30 °C or at 100 °C, it is possible to form either 3-aminoenones or 1,3-diketones, respectively. The newly developed method was used for the synthesis of avobenzone, an ingredient
具有 3-氨基烯酮或 1,3-二酮官能团的有机化合物非常重要,因为它们可以转化为大量的杂环或碳环化合物,或者可以用作金属配合物中的配体。我们已经实现了从芳基/杂芳基/烷基腈和 1-芳基/烷基 2-溴乙酮开始的 3-氨基烯酮和 1,3-二酮的新的、简单、直接和方便的合成。该反应是经典布莱斯反应的变体,它以锌和三甲基氯硅烷作为活化剂起作用。通过在 0–30 °C 或 100 °C 下用 HCl (3 n aq.) 进行反应中间体的水解,可以分别形成 3-氨基烯酮或 1,3-二酮。新开发的方法用于合成防晒乳液的一种成分阿伏苯宗。此外,
Trimethylchlorosilane-Mediated Mild α-Chlorination of 1,3-Dicarbonyl Compounds Promoted by Phenyliodonium Diacetate
作者:Yingpeng Su、Yulai Hu、Siying Chong、Lili Wu、Weigang Zhang、Junyan Ma、Xiaowei Chen、Danfeng Huang、Ke-Hu Wang
DOI:10.1055/s-0035-1561572
日期:——
Abstract Trimethylchlorosilane was used as chlorine source for the α-chlorination of 1,3-dicarbonyl compounds with phenyliodonium diacetate as oxidant at room temperature. The reaction allows the selective synthesis of α-monochlorinated products from different kinds of 1,3-dicarbonyl compounds in good yield. The potential possibility of this conversion for bromination has also been investigated. T
Free radical-promoted one carbon ringexpansion and chain extension of 1,3-diketones including 1,3-diarylpropane-1,3-diones and 2-aroyl-3,4-dihydro-2H-naphalen-1-one to generate corresponding 1,4-diketones are described.
Free radical ring expansion and spirocyclization of 1,3-diketone derivatives
作者:Wei Xu、Jian-Ping Zou、Xue-Jun Mu、Wei Zhang
DOI:10.1016/j.tetlet.2008.10.038
日期:2008.12
Free radical-promoted three-carbon ringexpansions of 1,3-diketones to form corresponding nine-membered 1,6-diketones and associated spirocyclization reactions are described.
描述了自由基促进的1,3-二酮的三碳环膨胀,形成相应的九元1,6-二酮,以及相关的螺环化反应。
Gold-catalyzed ring-expansion through acyl migration to afford furan-fused polycyclic compounds
作者:Changyuan Zhang、Huanfeng Jiang、Shifa Zhu
DOI:10.1039/c7cc00218a
日期:——
A gold-catalyzed ring-expansion reaction of alkynones to access furan-fused polycyclic compounds is reported. Mechanisticstudies revealed that the reaction might occur through a tandem of 1,2-acyl migration/Friedel-Crafts reaction.