已经开发了使用炔烃的铜催化分子内NH / CH环合反应。各种稠密官能化的杂环,如吡咯并[1,2- a ]吲哚,吲哚并[1,2 - c ]喹唑啉-2-酮,恶唑并[3,4- a ]吲哚和咪唑[1,5-由于苯胺部分,连接子部分和炔烃部分具有高度模块化的特征,因此以原子和分步经济的方式合成了α ]吲哚。通过简单地改变从二氧化剂叔将过氧化叔丁基(DTBP)转化为2,2,6,6-四甲基哌啶-1-氧基(TEMPO),该反应很容易转化为氨氧化途径,该途径从TEMPO夺取一个氧原子以生成5-芳酰基吡咯2个 机理实验表明,乙烯基自由基参与了该反应,而酰胺基自由基引发的自由基级联反应可能是造成这种转变的原因。
Divergent Palladium Iodide Catalyzed Multicomponent Carbonylative Approaches to Functionalized Isoindolinone and Isobenzofuranimine Derivatives
作者:Raffaella Mancuso、Ida Ziccarelli、Donatella Armentano、Nadia Marino、Salvatore V. Giofrè、Bartolo Gabriele
DOI:10.1021/jo500281h
日期:2014.4.18
formation of 3-[(dialkylcarbamoyl)methylene]isoindolin-1-ones through the intermediate formation of the corresponding 2-ynamide derivatives followed by intramolecular nucleophilic attack by the nitrogen of the benzamide moiety on the conjugated triple bond. On the other hand, 3-[(alkoxycarbonyl)methylene]isobenzofuran-1(3H)imines were selectively obtained when the oxidative carbonylation of 2-alkynylbenzamides
Electrochemical oxidative 5-exo-dig-oxo-halocyclization of o-alkynylbenzamides was achieved using readily available NaX (X = Cl, Br and I) salts under mild reactionconditions. The use of a cheap and highly stable sodiumhalide as a halide ion source is impressive for the synthesis of a variety of halogenated isobenzofuran-1-imines. This electrochemical protocol shows regioselectivity and excellent
Metal-free, one-pot tandem reactions of o-(1-alkynyl)benzamides proceed smoothly in the presence of Lawesson’s reagent leading to 1,3-dihydrobenzo[c]thiophene-imine derivatives in moderate to excellent yields under mild conditions. The method is highly regiospecific for the o-(1-alkynyl)benzothioamide, and only the five-membered-ring product is generated via a 5-exo-dig cyclization involving the
在Lawesson试剂的存在下,o-(1-炔基)苯甲酰胺的无金属单锅串联反应可顺利进行,从而在温和的条件下以中等至极好的收率得到1,3-二氢苯并[ c ]噻吩-亚胺衍生物。该方法对邻-(1-炔基)苯并硫代酰胺具有高度的区域特异性,并且通过涉及硫原子的5- exo- dig环化仅生成五元环产物。 邻-(1-炔基)苯并硫代酰胺-串联反应-Lawesson试剂-无金属-杂环
Nucleophilic Cyclization of<i>o</i>-Alkynylbenzamides Promoted by Iron(III) Chloride and Diorganyl Dichalcogenides: Synthesis of 4-Organochalcogenyl-1<i>H</i>-isochromen-1-imines
作者:Jose S. S. Neto、Davi F. Back、Gilson Zeni
DOI:10.1002/ejoc.201403534
日期:2015.3
4-organochalcogenyl-1H-isochromen-1-imines in good yields and with good selectivities. The reaction took place with 0.5 equiv. of the diorganyl dichalcogenides, which demonstrates that both halves of the diorganyl dichalcogenides (RYYR 2RY) were incorporated into the final product. Mechanistic studies suggested that the regioselectivity of the cyclization is governed by a seleniranium ion, a key intermediate formed