摘要通过2-氯喹啉-3-甲醛的三组分反应,在温和的反应条件下,在绿色溶剂中开发了吡啶[1,2- a ]嘧啶/咪唑并[1,2- a ]吡啶的快速无金属杂环反应。,丙二腈和亚硝基缩醛,它们是由1,1-双(甲硫基)-2-硝基乙烯与二胺在绿色溶剂中于EtOH回流条件下反应制得的。这种一锅法非常简单,分两个步骤进行。本序列可视为具有优良纯度和高收率的对环境有益的过程。 图形摘要通过2-氯喹啉-3-甲醛,丙二腈/一锅三组分反应制备吡啶并[1,2- a ]嘧啶/咪唑并[1,2- a ]吡啶的有效,通用方法描述了在温和且无催化剂的条件下以优异的收率得到的2-氰基乙酸乙酯和亚硝基缩醛。该方案的主要优点是高产率,温和且无催化剂的条件,较短的反应时间和绿色溶剂的应用。
Synthesis of 1,2,3,5-substituted pyrroles from α-bromoacetophenones and 2-nitroethene-1,1-diamines
作者:Sanaz Mojikhalifeh、Alireza Hasaninejad
DOI:10.1016/j.tetlet.2017.05.063
日期:2017.6
The simple synthesis of 1,2,3,5-substituted pyrrolesfrom α-bromoacetophenones and 2-nitroethene-1,1-diamines in the presence of K2CO3 in DMF at 120 °C is described. A range of fused and non-fused polysubstituted pyrroles were prepared in high yields with short reaction times.
描述了在120°C的DMF中,在K 2 CO 3存在下,由α-溴苯乙酮和2-硝基乙烯-1,1-二胺简单合成1,2,3,5-取代的吡咯。以高收率和较短的反应时间制备了一系列稠合和非稠合的多取代吡咯。
Oxidation Strategy for the Synthesis of Regioisomeric Spiroisobenzofuranopyrroles: Facile Entries to Spiro[isobenzofuran-1,2′-pyrrole] and Spiro[isobenzofuran-1,3′-pyrrole] Derivatives
developed to synthesize two kinds of racemic spiroisobenzofuranopyrrole analogues as regioisomers. In the presence of sodiumperiodate, cis-indeno[1,2-b]pyrrol-4(1H)-ones were converted into spiro[isobenzofuran-1,2′-pyrrole] derivatives by a two-step process. In addition, oxidative reactions promoted by lead tetraacetate were demonstrated using cis-indeno[2,1-b]pyrrol-8(1H)-ones as substrates, affording
Isomerization of Ninhydrin-Heterocyclic Ketene Aminal Adducts: Kinetic versus Thermodynamic Control, Solvent Dependency and Mechanism
作者:Nanyang Chen、Minming Zou、Xue Tian、Fengjuan Zhu、Danping Jiang、Jiagao Cheng、Xusheng Shao、Zhong Li
DOI:10.1002/ejoc.201402677
日期:2014.10
Ninhydrin and heterocyclic ketene aminals (HKAs) are versatile building blocks in organic chemistry. Reactions of ninhydrin with HKAs initially produced the kinetic products indeno[1,2-b]pyrrol-4(1H)-one derivatives, which could further isomerize to thermodynamic counterparts indeno[2,1-b]pyrrol-8(1H)-ones. The isomerization showed a strong solvent dependency and occurred through a decomposition–reconstruction
They are widely used in the synthesis of bioactive molecules and are, thus, an important class of heterocycles in bioactive molecules discovery. In pursuit of neonicotinoids with bridged heterocycles, novel neonicotinoids with the oxa-aza[3.3.3]propellane structure were designed and synthesized. Evaluation of these compounds as insecticides showed that one had moderate activity against cowpea aphid ( Aphis
One-Pot, Three-Component Synthesis of 1,8-Naphthyridine Derivatives from Heterocyclic Ketene Aminals, Malononitrile Dimer, and Aryl Aldehydes
作者:Xusheng Shao、Zhong Li、Feilong Sun、Fengjuan Zhu
DOI:10.1055/s-0034-1378823
日期:——
was developed for the access of multisubstituted 1,8-naphthyridinederivatives through a one-pot, three-component protocol from heterocyclic ketene animals, malononitrile dimer, and aryl aldehydes in high yields. The 1,8-naphthyridines were formed via Knoevenagel condensation, aza–ene reaction, imine–enamine tautomerization, and intramolecularcyclization.