通过芳族醛与环戊烯的顺序反应合成了一系列取代的吲哚 叠氮基乙酸乙酯 在......的存在下 乙醇钠形成相应的乙基α-叠氮基-β-芳基丙烯酸乙酯(Knoevenagel法),然后进行溶剂介导的热分解(Hemetsberger法)。使用牺牲亲电试剂时,α-叠氮基-β-芳基丙烯酸乙酯的分离收率显着提高三氟乙酸乙酯。对α-叠氮基-β-芳基丙烯酸乙酯的1 H NMR和1 H- 13 C NMR耦合分析表明,该缩合反应具有立体特异性,只能检测到Z异构体。溶剂介导的间位取代的乙基α-叠氮基-β-芳基丙烯酸酯的热处理导致5位和7位取代的吲哚的形成,其中5位区域异构体比7位区域异构体略受青睐。(2 Z,2 Z ')-二乙基3,3'-(1,3-亚苯基)双(2-叠氮基丙烯酸酯)和(2 Z,2 Z ')-二乙基3,3'-(1的相似热处理,4-亚苯基)双(2-叠氮基丙烯酸酯)专门生产吡咯并吲哚,1,5-二氢吡咯并[2
featuring the 1,3-dipolarcycloaddition reaction of α-azido acrylates and aromatic oximes was developed. This procedure provides an efficient, straightforward and metal-free method for the synthesis of 3,4,5-trisubstituted isoxazoles under mild reaction conditions. A novel, one-pot, cascade reaction sequence featuring the 1,3-dipolarcycloaddition reaction of α-azido acrylates and aromatic oximes was
A Bu
<sub>4</sub>
N[Fe(CO)
<sub>3</sub>
(NO)]‐Catalyzed Hemetsberger–Knittel Indole Synthesis
作者:Aslihan Baykal、Bernd Plietker
DOI:10.1002/ejoc.201901864
日期:2020.3.8
The anionic Fe complex Bu4N[Fe(CO)3(NO)] catalyzes the denitrogenative C(sp3)–H amination of a variety of aryl vinyl azides to the corresponding indoles in good to excellent yields.
阴离子Fe络合物Bu 4 N [Fe(CO)3(NO)]催化多种芳基乙烯基叠氮化物对相应的吲哚进行脱氮C(sp 3)-H胺化反应,收率很好。
Formal [4+2]-Annulation of Vinyl Azides with N-Unsaturated Aldimines
functionalized quinolines and pyridines could be synthesized by BF3⋅OEt2‐mediated reactions of vinylazides with N‐aryl and N‐alkenyl aldimines, respectively. The reaction mechanism could be characterized as formal [4+2]‐annulation, including unprecedented enamine‐type nucleophilic attack of vinylazides to aldimines and subsequent nucleophilic cyclization onto the resulting iminodiazonium ion moieties.
Mn(III)-Mediated Reactions of Cyclopropanols with Vinyl Azides: Synthesis of Pyridine and 2-Azabicyclo[3.3.1]non-2-en-1-ol Derivatives
作者:Yi-Feng Wang、Shunsuke Chiba
DOI:10.1021/ja905110c
日期:2009.9.9
to the formation of 2-azabicyclo[3.3.1]non-2-en-1-ol derivatives using a catalytic amount of Mn(acac)(3). These reactions may be initiated by a radicaladdition of beta-keto radicals, generated by the one-electron oxidation of cyclopropanols, to vinyl azides to give iminyl radicals, which would cyclize with the intramolecular carbonyl groups. In addition, versatile transformations of 2-azabicyclo[3.3