Self-Catalyzed Rapid Synthesis of <i>N</i>-Acylated/<i>N</i>-Formylated α-Aminoketones and <i>N</i>-Hydroxymethylated Formamides from 3-Aryl-2<i>H</i>-Azirines and 2-Me/Ph-3-Aryl-2<i>H</i>-Azirines
作者:Aramita De、Sougata Santra、Grigory V. Zyryanov、Adinath Majee
DOI:10.1021/acs.orglett.0c01206
日期:2020.5.15
by the reaction of 3-aryl-2H-azirines and highly substituted 2-Me/Ph-3-aryl-2H-azirines with various carboxylic acids under ambient air within 10 min at room temperature. N-Trifluoroacetylated α-aminoketones with different substituents have been reported in the presence of trifluoroacetic acid. This protocol is equally effective to synthesize N-formylated α-aminoketone and N-hydroxymethylated formamide
Cu/Ag-Catalyzed Reaction of Azirines with Anthranils: Synthesis of (Quinazolin-2-yl)methanone Derivatives
作者:Yajun Sun、Huimin Sun、Ying Wang、Fang Xie
DOI:10.1021/acs.orglett.0c02222
日期:2020.9.4
to expedite syntheses of (quinazolin2-yl)methanone derivatives. The transformation represents an unprecedented approach which employs a copper catalysis to cleave both a N–C2 azirine bond and N–O anthranil bond. Subsequently, an unexplored 1,3-hydroxyl migration and β-N elimination are likely the key to access (quinazolin-2-yl)methanone derivatives.
Cu / Ag催化3-芳基2 H-叠氮基与蒽的环化反应已加快了(quinazolin2-yl)methanone衍生物的合成。该转变代表了一种空前的方法,该方法采用铜催化来裂解N–C 2叠氮键和N–O蒽键。随后,未经探索的1,3-羟基迁移和β-N消除可能是获得(喹唑啉-2-基)甲酮衍生物的关键。
Radical Anion of Nitrile Ylide by Dual Beam Irradiation of 3-(4-Biphenylyl)-2H-azirine at Low Temperature
作者:Akito Ishida、Ikuo Naito、Setsuo Takamuku
DOI:10.1246/cl.1992.1913
日期:1992.10
Photolysis and the successive γ-radiolysis of 3-(4-biphenylyl)-2H-azirine at 77 K resulted in the formation of a novel intermediate with an absorption maximum at 425 nm, which was produced by one-electron reduction of the nitrile ylide. The intermediate was also produced by photochemical ring-opening of the azirine radical anion.
3-(4-联苯基)-2H-氮丙啶在 77 K 下的光解和连续 γ-辐射解导致形成了一种新型中间体,在 425 nm 处具有最大吸收,这是由腈叶立德的单电子还原产生的. 中间体也是通过氮杂自由基阴离子的光化学开环产生的。
Cascade Reaction of 2-Naphthols and Azirines: One-Pot Synthesis of C-3 Naphthol-Substituted Benzo[<i>e</i>]indoles
A copper-catalyzed annulation of 3-aryl-2H-azirines with 2-naphthols has been developed for the rapid assembly of C-3-naphthol-substituted benzo[e]indoles in one pot. This cascade reaction was realized through dearomatic nucleophilic ring opening of azirine, intramolecularcyclization, and oxidative cross-dehydrogenative coupling to furnish the important unreported π-expanded naphthol/benzo[e]indole
已开发出铜催化的 3-芳基-2 H-氮杂环与 2-萘酚环化,用于在一个锅中快速组装 C-3-萘酚取代的苯并 [ e ] 吲哚。这种级联反应是通过氮丙啶的脱芳亲核开环、分子内环化和氧化交叉脱氢偶联来实现的,以提供重要的未报道的 π 扩展萘酚/苯并 [ e ] 吲哚联芳基化合物。
Ligand- and Substrate-Controlled Chemodivergent Pd-Catalyzed Annulations of Cyclic β-Keto Esters with 3-Aryl-2<i>H</i>-azirines
Chemodivergent Pd-catalyzed annulations of cyclic β-keto esters with 3-aryl-2H-azirines have been developed to provide rapid access to eight-membered ringlactams, bicyclic 3,4-dihydro-2H-pyrrole derivatives, and (E)-methyl [2-(2-oxocyclohexylidene)-2-phenylethyl]carbamates with high efficiency. The chemoselectivity can be determined by tuning the mono- or bisphosphine ligands as well as the substrate